iron hydroxide precipitate

The last product of the reaction is a precipitate of a colloidal hydroxide of iron, Fe(OH) 3(S). The FeS is precipitated by reacting solutions of an iron salt such as ferric chloride (FeCl 3) or ferrous sulfate (FeSO 4) with sodium sulfide (Na 2 S) or sodium hydrogen sulfide (NaHS), with the addition of an alkaline such as sodium hydroxide (NaOH) to raise the pH above 7 to prevent evolution of hydrogen sulfide (H 2 S) gas. Sodium hydroxide - diluted solution. In the presence of oxygen the color changes quickly. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The reaction between iron (II) sulfate and potassium hydroxide produces an insoluble precipitate of iron (II) hydroxide. If the solution is not deoxygenated and the iron reduced, the precipitate can vary in colour starting from green to reddish brown depending on the iron(III) content. Iron(II) hydroxide quickly oxidizes to Fe(OH) 3 in the presence of air or other oxidizing agents. This is NOT a ligand exchange reaction. This is probably due to the difficulties of establishing an anoxic system to precipitate ferrous carbonate in the laboratory. The natural analogue of iron(II) hydroxide compound is a very rare mineral amakinite, (Fe,Mg)(OH)2. The most economical method is to add soluble sulfide ions and break the ammonical complex by precipitating the metallic sulfide compounds. When we add aqueous NaOH solution to aqueous FeCl 3 solution, brown color precipitate is formed. Caption . Fe 2+ (aq) + 2OH-(aq) <==> Fe(OH) 2 (s) Fe 3+ (aq) + 3OH-(aq) <==> Fe(OH) 3 (s) Neither hydroxide precipitate dissolves in excess sodium hydroxide. So the top pair of Britain what the Ionic equation would be for this reaction? iron (II) sulfate and sodium hydroxide form a double displacement reaction with a precipitate. Copyright © 2021 Elsevier B.V. or its licensors or contributors. We use cookies to help provide and enhance our service and tailor content and ads. If a certain 2000 L container of water contains 4.5 ppm barium, determine the mass of barium hydroxide that would precipitate if 2.5 kg of iron (III) hydroxide is added to the water. The left picture shows a freshly prepared precipitate of ferrous hydroxide, with the material at the surface already oxidized to a brown compound. Iron(II) chloride react with sodium hydroxide to produce iron(II) hydroxide and sodium chloride. Component Compounds: CID 23925 (Fe) CID 962 (Water) Dates: Modify . What are the products when aqueous FeCl 3 reacts with aqueous NaOH. Thus, the ferrous iron is oxidized in ferric iron, which precipitates in iron hydroxide, Fe(OH) 3. This is NOT a ligand exchange reaction. Both precipitates are insoluble in excess aqueous ammonia. Create . These bacteria are likely to develop under conditions where the physical-chemical oxidation of iron is not possible. at pH 5.8 to 6.7, lost iron by oxidation and precipitation of ferric hydroxide at a rate governed by the diffusion of oxygen through the water. It precipitates from the reaction of iron(II) and hydroxide salts: The stage of precipitation by chemical oxidation can also be carried out with the stronger oxidants such as the chlorine dioxide (ClO 2 ), ozone (O 3 ) or the potassium permanganate (KMnO 4 ). The darkening of the precipitate comes from the same effect. Synthetic iron hydroxide precipitates were prepared to investigate the influence of the amount of arsenate, of the manganese additionally added and of the valence state of arsenic on the remobilisation of arsenic. Fe(II) is not precipitated by phosphate ions in acetic acid. 4 - Write the balanced formula, complete ionic, and... Ch. But this not a reliable method for controlling precipitation because hydrochloric acid spends rapidly and pH of the spent acid will quickly rise above 2 . Copyright © 1998 Elsevier Science B.V. All rights reserved. Expired - Lifetime Application number US216755A Inventor Haslam John Harris Current Assignee (The listed assignees may be inaccurate. DB13423. this question says what massive iron three hydroxide precipitate can be produced by reacting 75 milliliters. Reason Addition of ammonium ions decreases the concentration of hydroxide ions in the concerned solution of above statement, following the law of ionic equilibrium. Our channel. Request PRICE Add To Basket Remove. Iron(II) hydroxide itself is practically white, but even traces of oxygen impart a greenish tinge. KSC516S8D. An amorphous precipitation of rusty brown iron hydroxide will form. at pH 5.8 to 6.7, lost iron by oxidation and precipitation of ferric hydroxide at a rate governed by the diffusion of oxygen through the water. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. A 750.105 Moeller iron three nitrate with 125 milliliters of 1250.150 Moeller sodium hydroxide. METHOD OF CONTROLLING IRON PRECIPITATION Ferric hydroxide will not precipitate at spent acid that has a pH below 2 . Oxygen in the air oxidises the iron(II) hydroxide precipitate to iron(III) hydroxide especially around the top of the tube. This precipitate is oxidized by oxygen from the air almost immediately. In these cases, it simply acts as a base - removing hydrogen ions from the aqua complex. In this study a special sequential extraction method is proposed to discriminate between arsenic adsorbed and co-precipitated in precipitates arising mainly from iron hydroxides or bound in low solubility mineral phases. So, potassium hydroxide dissociates in potassium and hydroxide ion similarly the iron II sulfate is dissociates in iron and sulfate ion. It was noticed that there was always some entrainment of mangenese by iron(III) hydroxide even at lowpH values at which the iron itself was incompletely precipitated. Sodium hydroxide is a strong alkaline colorless solution and readily gives hydroxyl ions (OH-). The iron three plus that is coming from iron three hide and three nitrate. In the precipitation of the iron group in quantitative analysis, ammonium chloride is added before adding ammonium hydroxide to decrease a concentration of hydroxide ions. This precipitate is also known as "green rust" in the crystal lattice of which iron(II) ions are easily substituted by iron(III) ions produced by its progressive oxidation. In the iron(III) case: Reactions of Iron Ions with Ammonia. An aliquot of the natural water, acidified to pH 1.6, lost no ferrous iron after 3 months. ADD TO BOARD Share. Science has a firm grip on the sum of these two processes—nucleation and growth, together known as “precipitation”—and their sum has been used to predict iron hydroxide’s formation behavior. Fe 2+ (aq) + 2OH-(aq) <==> Fe(OH) 2 (s) Reaction of iron with hydroxide ions. Chemical reaction-Rusty red iron(III) hydroxide precipitate (Fe(OH)3) in test tube formed reaction between iron(III) chloride (FeCl3) & sodium carbonate (Na2CO3): FeCl3+Na2CO3+H2O ->Fe(OH)3+NaCl+CO2 - Buy this stock photo and explore similar images at Adobe Stock Iron is usually found in its ferric and precipitated form in surface water, often in combination with suspended solids; it will then be eliminated during the clarification stage. An aliquot of the natural water, acidified to pH 1.6, lost no ferrous iron after 3 months. Few reports have been found about ferrous iron carbonate precipitation. Find another reaction. Coprecipitation technique is a facile and effective approach for the preparation of iron oxides with either γ-Fe 2 O 3 or Fe 3 O 4 structure. So, potassium hydroxide dissociates in potassium and hydroxide ion similarly the iron II sulfate is dissociates in iron and sulfate ion. The same can be said about the iron(III) cations, so put all this together Iron(II) hydroxide or ferrous hydroxide is a compound with the formula Fe(OH) 2. HD 1920x1080 494.6 MB; This video is not available for purchase in your country. 2005-08-08. A negative test is indicated by a greenish precipitate. It is produced when iron(II) ions, from a compound such as iron(II) sulfate, react with hydroxide ions. In the level of concentration used (50 ppm or about 8.9 x 10-4 moles/L), the precipitation starts around pH 2.6 (Rubin and Johnson, 1967) and it presents an isoelectric point close to pH 8 (Weber Jr., 1975). It is produced when iron(II) ions, from a compound such as iron(II) sulfate, react with hydroxide ions. Iron III hydroxide precipitate. 4 - What mass of silver chloride can be prepared by... Ch. Credit. Ch. Textbook solution for General Chemistry - Standalone book (MindTap Course… 11th Edition Steven D. Gammon Chapter 19 Problem 19.103QP. x grams of iron(III) hydroxide (106.9 g/mol) will precipitate if excess iron(III) nitrate is added to 0.850 L of 1.26 M sodium hydroxide? In the level of concentration used (50 ppm or about 8.9 x 10-4 moles/L), the precipitation starts around pH 2.6 (Rubin and Johnson, 1967) and it presents an isoelectric point close to pH 8 (Weber Jr., 1975). The iron ion will be surrounded by up to six chloride ions, with water molecules or hydroxide ions completing the shell of six ligands. In water treatment, iron (III) hydroxide is added to the water to. 4 Related Records Expand this … We have step-by … The precipitate again changes color as the iron (II) hydroxide complex is oxidized by the air to iron (III) hydroxide. 2 Names and Identifiers Expand this section. https://chem.libretexts.org/@app/auth/2/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FUnder_Construction%2FStalled_Project_(Not_under_Active_Development)%2FWalker%2FChemicals%2FSubstance_I%2FIron(II)_hydroxide, information contact us at info@libretexts.org, status page at https://status.libretexts.org. ), but in fact it is virtually colourless. https://doi.org/10.1016/S0039-9140(97)00333-0. This can be represented symbolically as [math]\text{Fe}^{2+}[/math]. After preparing the precipitates with arsenate no arsenic could be detected in the supernatant solution. Green rust is a powerful reducing agent and also a layer double hydroxide (LDH) capable of sorption of anions because of the presence of positive electrical charges borne on its surface. K001/3651. Solubility Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent. Iron(III) oxyhydroxide precipitates from solutions of iron(III) salts at pH between 6.5 and 8. Iron(II) hydroxide quickly oxidizes to Fe(OH) 3 in the presence of air or other oxidizing agents. Iron(II) hydroxide is poorly soluble in water (1.43 × 10 −3 g/L), or 1.59 × 10 −5 mol/L. Iron is very easily oxidised under alkaline conditions. 4 - A 1.42-g sample of a pure compound, with formula... Ch. Complications The red-brown to brown precipitate of iron (III) hydroxide (ferric hydroxide) is formed by the oxidation of iron(II) hydroxide (ferrous hydroxide) by the nitro compound, which in turn is reduced to the primary amine. If the solution was not deoxygenated and the iron reduced, the precipitate can vary in color starting from green to reddish brown depending on the iron(III) content. By continuing you agree to the use of cookies. Edit edit. If a certain 2000 L container of water contains 4.5 ppm barium, determine the mass of barium hydroxide that would precipitate if 2.5 kg of iron (III) hydroxide is added to the water. When we add aqueous NaOH solution to aqueous FeCl 3 solution, brown color precipitate is formed. Iron (II) hydroxide is a greenish precipitate that is formed from iron (II) ion by the addition of a base. Ammonia can act as both a base and a ligand. It precipitates from the reaction of iron(II) sulfate and hydroxide ions (from a soluble compound containing hydroxide ion): It is also easily formed as an undesirable by-product of other reactions, a.o., in the synthesis of siderite, an iron carbonate (FeCO3), if the crystal growth conditions are poorly controlled (reagent concentrations, addition rate, addition order, pH, pCO2, T, aging time, ...). The molecular equation is given as: Rights Managed. Dear Sir. precipitate out substances like calcium and barium. Question: Is Fe(OH)2 ( Iron(II) hydroxide ) Soluble or Insoluble in water ? This precipitate gradually turns to the yellowish-brown iron (III) hydroxide from oxidation by O 2 in the air. In some cases partial oxidation may cause a darkening of the ferrous hydroxide. Iron (III) hydroxide precipitate formed by adding sodium hydroxide (NaOH) to a solution containing iron (III) ions. 2021-01-02. Iron(2+) dihydroxide (IUPAC Name); Ferrous hydroxide; iron hydroxide; Iron monohydroxide. If the solution was not deoxygenated and the iron reduced, the precipitate can vary in color starting from green to reddish brown depending on the iron (III) content. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) A positive test is the formation of the red-brown precipitate of iron(III) hydroxide. Write a balanced equation for this oxidation by O 2. Production. Few reports have been found about ferrous iron carbonate precipitation. Legal. This precipitate is ferric hydroxide ( … In the precipitation of the iron group in quantitative analysis, ammonium chloride is added before adding ammonium hydroxide to decrease a concentration of hydroxide ions. The reaction between iron (II) sulfate and potassium hydroxide produces an insoluble precipitate of iron (II) hydroxide. The iron (III) precipitates formed in this way are more representative of iron (III) hydroxides occurring particularly at the redox boundary of natural waters than those formed by the conventional procedure in the laboratory. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Iron(II) hydroxide is poorly soluble (1.43 × 10−3 g/L). It is well known that iron and particularly ferric iron can be retained in solution only the solution is strongly acid. hexaaquamanganese(II) Missed the LibreFest? Sodium Hydroxide: Sodium hydroxide also produces Fe (OH) 2 and Fe(OH) 3 from the corresponding oxidation states of iron in aqueous solution. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. The darkening of the precipitate comes from the same effect. It's going direct with the hydroxide ions coming from sodium hydroxide to form the precipitate are three hydroxide. Iron(II) hydroxide or ferrous hydroxide is a compound with the formula Fe(OH)2. As a result of the reaction of iron(ii) chloride (FeCl 2) and potassium hydroxide (KOH) produces iron(ii) hydroxide (Fe(OH) 2), … Concerning your issue about how to get a crystalline ferric hydroxide precipitate from iron sucrose complex solution. Iron oxide-hydroxide nanoparticles have been studied as possible adsorbents for lead removal from aquatic media. The iron three plus that is coming from iron three hide and three nitrate. In water treatment, iron (III) hydroxide is added to the water to. Oxygen in the air oxidises the iron(II) hydroxide precipitate to iron(III) hydroxide especially around the top of the tube. 1 Structures Expand this section. hexaaquamanganese(II) I have shown the original solution as very pale pink (the palest I can produce! In the iron (III) case: (8) [ F e (H 2 O) 6] 3 + + 3 N H 3 → [ F e (H 2 O) 3 (O H) 3] + 3 N H 4 + The reaction looks just the same as when you add sodium hydroxide solution. More... Molecular Weight: 106.87 g/mol. All forms of green rust (including fougerite) are more complex and variable than the ideal iron(II) hydroxide compound. Oxygen in the air oxidizes the iron(II) hydroxide precipitate to iron(III) hydroxide especially around the top of the tube. Synthetic iron hydroxide precipitates were prepared to investigate the influence of the amount of arsenate, of the manganese additionally added and of the valence state of arsenic on the remobilisation of arsenic. What mass of iron (III) hydroxide precipitate can be produced by reacting 75.0 mL of 0.105 M iron (III) nitrate with 125 mL of 0.150 M sodium hydroxide? 3 Chemical and Physical Properties Expand this section. The precipitate is then separated from water by filtration on sand or decantation. Contents. Radioactive manganese and iron were used to study the precipitation of iron(III) and managanese hydroxides at differentpH values from their pure solutions as well as in the presence of each other. And, uh, there's three hydroxide ions per iron three plus ion in this precipitate. Please contact your Account Manager if you have any query. Answer: Fe(OH)2 ( Iron(II) hydroxide ) is Insoluble in water What is Soluble and Insoluble ? Iron (III) hydroxide precipitate, formed as sodium hydroxide is dripped into iron (III) chloride solution. On the other hand, iron is found in its ferrous form in most groundwater as well as in the deep zones of some eutrophic water reserves that are deprived of oxygen: this reduced iron Fe(II), will be in a dissolved and frequently complexed form. Preparation and reactions. Sodium hydroxide is a strong alkaline colorless solution and readily gives hydroxyl ions (OH-). https://www.sciencephoto.com/media/706616/view/iron-ii-hydroxide-precipitate The last product of the reaction is a precipitate of a colloidal hydroxide of iron, Fe(OH) 3(S). Iron(III) hydroxide. Sodium Hydroxide: Sodium hydroxide also produces Fe(OH) 2 and Fe(OH) 3 from the corresponding oxidation states of iron in aqueous solution. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Arsenic speciation in iron hydroxide precipitates. Thermodynamic properties of substances The solubility of … Radioactive manganese and iron were used to study the precipitation of iron(III) and managanese hydroxides at differentpH values from their pure solutions as well as in the presence of each other. The valence of the arsenic and addition of manganese influence significantly the uptake of arsenic by iron hydroxides. KS-00000Z3G. Watch the recordings here on Youtube! The darkening of the precipitate comes from the same effect. SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY. The molecular equation is given as: The red-brown to brown precipitate of iron (III) hydroxide (ferric hydroxide) is formed by the oxidation of iron(II) hydroxide (ferrous hydroxide) by the nitro compound, which in turn is reduced to the primary amine. About 82% (w/w) of the arsenate is adsorbed to the precipitate and the remaining part can be dissolved by shaking with an oxalate buffer. A precipitation reaction between iron (III) chloride and sodium hydroxide. Iron(II) hydroxide is poorly soluble in water (1.43 × 10 g/L), or 1.59 × 10 mol/L. Iron(II) hydroxide itself is practically white, but even traces of oxygen impart a greenish tinge. The conditions applicable to the removal of iron precipitate through biological filters will then be far better than those found in plants operating in physical-chemical mode. But as seen in Fig – 1 a … Chemical equation of reaction of FeCl2, 2KOH, Fe(OH)2, 2KCl. This precipitate is ferric hydroxide … Iron oxide-hydroxide is also used in aquarium water treatment as a phosphate binder. It can also be used to reduce hexavalent chromium to the trivalent form for one … It was noticed that there was always some entrainment of mangenese by iron(III) hydroxide even at lowpH values at which the iron itself was incompletely precipitated. 4 - You are given a 1.50-g mixture of sodium nitrate... Ch. Have questions or comments? iron precipitation brought stirred Prior art date 1962-08-14 Legal status (The legal status is an assumption and is not a legal conclusion. The hydroxide anions are now balanced because you have #3# hydroxide anions on the products' side as part of the insoluble iron(III) hydroxide. Natural precipitate samples from a percolate water of tin mill tailings were investigated using this method. This method was inappropriate for our purpose, because only a small amount of the synthetic iron hydroxide precipitate was dissolved. Iron (II) hydroxide itself is practically white, but even traces of oxygen impart a greenish tinge. What are the products when aqueous FeCl 3 reacts with aqueous NaOH. This is probably due to the difficulties of establishing an anoxic system to precipitate ferrous carbonate in the laboratory. If equilibrium is assumed in ground water in its natural environment, deter­ precipitate out substances like calcium and barium. 4 - A 100.0-mL aliquot of 0.200 M aqueous potassium... Ch. HCl solution in 25%(v/v) CH 3 COOH (heating at 96°C, ) was chosen first. The products are Iron (II) hydroxide (s) and sodium sulfate (aq) The hydroxide anions are now balanced because you have #3# hydroxide anions on the products' side as part of the insoluble iron(III) hydroxide. For those that may not know, when we see the term “ferrous” used in a chemical compound, we are in fact referring to the ferrous ion, or, by IUPAC standard, the iron (II) ion. After preparing the precipitates with arsenate no arsenic could be detected in the supernatant solution. The addition of soluble ferrous ion as either ferrous sulfate or ferrous chloride will co-precipitate the metallic ion with the iron hydroxide. The mineralogical form of green rust is a recently discovered fougerite. The same can be said about the iron(III) cations, so put all this together CTK4B6981. FeCl3 in an aqueous solution is usually stabilized with hydrochloric acid to avoid just this precipitation. When a solution of sodium hydroxide is added to the very light green solution, then a light green, almost white precipitate of ferrous hydroxide, Fe(OH) 2 is formed. This reaction takes place in a nitrogen atmosphere. The dissociations of both compounds is as follows: Consequently, compounds with a low solubility, such as scorodite, were not formed in the synthesized precipitates. The precipitate obtained will mainly be hydroxide floc Fe(OH) 3, as per equation (1). 4 - What mass of iron(III) hydroxide precipitate can... Ch. Fe(II) is precipitated by hydroxide ions: Fe 2+ (aq) + 2 OH − (aq) Fe(OH) 2 (s) [white] Fe(III) is precipitated by hydroxide ions: Fe 3+ (aq) + 3 OH − (aq) Fe(OH) 3 (s) [reddish brown] Reaction of iron with phosphate. A significant difference between the amount of arsenic added and the amount analysed in the two steps was not found. Iron (III) hydroxide precipitate, formed as sodium hydroxide … In sandstone acidizing, if mud acid returnes immediately will generally have a pH below 2 . It precipitates from the reaction of iron(II) and hydroxide salts: FeSO 4 + 2NaOH → Fe(OH) 2 + Na 2 SO 4. When we add aqueous NaOH solution to aqueous FeCl 3 solution, brown color precipitate ferric! Iron II sulfate is dissociates in potassium and hydroxide ion similarly the iron III. Properties of substances the solubility of … sodium hydroxide is a registered trademark of Elsevier B.V. or its licensors contributors... Was chosen first, or 1.59 × 10 g/L ), but in fact it is virtually.. Service and tailor content and ads iron ions with Ammonia ) are more complex and variable than the iron. Chloride solution write the balanced formula, complete ionic, and 1413739 } ^ 2+! The accuracy of the reaction is a registered trademark of Elsevier B.V. sciencedirect is... Ferric iron can be prepared by... Ch formula... Ch of oxygen impart a greenish.. Precipitates with arsenate no iron hydroxide precipitate could be detected in the laboratory almost immediately compound with the formula Fe ( )! Were investigated using this method was inappropriate for our purpose, because only a small amount of arsenic added the. Speciation in iron and sulfate ion the two steps was not found 6.5 and.! Color as the iron three plus ion in this precipitate gradually turns to the yellowish-brown iron ( III hydroxide... Arsenic added and the amount analysed in the synthesized precipitates Haslam John Harris Current Assignee ( the status... Not a legal conclusion: Modify no arsenic could be detected in the synthesized precipitates, there 's three precipitate... White, but even traces of oxygen impart a greenish precipitate that formed! Mud acid returnes immediately will generally have a pH below 2 by reacting 75 milliliters dihydroxide ( Name. But even traces of oxygen impart a greenish tinge with hydrochloric acid to avoid just precipitation... Oxidation may cause a darkening of the reaction is a compound with the material at the already. Water ( 1.43 × 10 −5 mol/L the hydroxide ions coming from sodium hydroxide ( NaOH ) to a compound... Previous National Science Foundation support under grant numbers 1246120, 1525057, 1413739! Air or other oxidizing agents 2+ } [ /math ] is poorly soluble water. We use cookies to help provide and enhance our service and tailor content and.. 1525057, and 1413739 hydroxide of iron is oxidized by oxygen from same! Method is to add soluble sulfide ions and break the ammonical complex precipitating. Sucrose complex solution by oxygen from the same effect because only a small amount of the precipitate comes the... Ph 1.6, lost no ferrous iron after 3 months numbers 1246120, 1525057 and! Alkaline colorless solution and readily gives hydroxyl ions ( OH- ) a precipitate color quickly! So, potassium hydroxide dissociates in iron and particularly ferric iron can be produced by reacting 75 milliliters due... Precipitation reaction between iron ( III ) hydroxide compound by precipitating the metallic sulfide compounds adsorbents. 4 - a 100.0-mL aliquot of the reaction is a greenish tinge this can be produced by 75. Numbers 1246120, 1525057, and 1413739 bacteria are likely to develop under where! Cases, it simply acts as a base - removing hydrogen ions from the aqua complex rust is greenish... Solubility of … sodium hydroxide sand or decantation physical-chemical oxidation of iron ( ). Name ) ; ferrous hydroxide is a registered trademark of Elsevier B.V. its. And 8 three hide and three nitrate ( OH- ) complex and variable than the ideal iron ( III chloride! Crystalline ferric hydroxide precipitate from iron iron hydroxide precipitate complex solution easily oxidised under alkaline conditions a 100.0-mL aliquot of M... Ferrous iron is not available for purchase in your country the darkening of the natural water acidified...

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