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PPA1 Preparation of Potassium Trioxalatoferrate

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Introduction

Unit 1 PPA 1: Preparation of Potassium Trioxalatoferrate Aim: The aim of the investigation was to prepare Potassium Trioxalatoferrate (III) from Ammonium Sulphate and then calculate the percentage yield. Introduction a) Ligand The oxalate ion can act as a ligand as it binds to a central metal ion to form a complex ion by the donation of one or more electron pairs into unfilled metal orbitals. In this case three negatively charged oxalate ions surround one positively charged Fe3+. The three oxalate ions attach themselves to the Fe3+ at six points creating an octahedral shape. This results in the metal complex having a net total charge of -3. b) Potassium Trioxalatoferrate http://upload.wikimedia.org/wikipedia/commons/thumb/3/33/Potassium-ferrioxalate-2D.png/250px-Potassium-ferrioxalate-2D.png 07/03/10 c) Relevant Equations Step 1: (NH4)2Fe(SO4)2.6H2O + H2C2O4 --> FeC2O4 + H2SO4 + (NH4)HSO4 +6H20 Step 2: 6FeC2O4 + 3H2O2 + 6K2C2O4 --> 4K3[Fe(C2O4)3] + 2Fe(OH)3 Step 3: 2Fe(OH)3 + 3H2C2O4 +3K2C2O4 --> 2K3(Fe(C2O4)3) ...read more.

Middle

ions to iron (III) ions. Procedure * A 100 cm3 glass beaker was weighed and approximately 5g hydrated ammonium iron(II) sulphate was added. The beaker and its contents were then reweighed. * Approximately 15 cm3 and 1 cm3 sulphuric acid were added to the ammonium iron(II) sulphate. The mixture was then warmed to dissolve the solid * After the ammonium iron(II) sulphate was dissolved 25 cm3 oxalic acid was added. (NH4)2Fe(SO4)2.6H2O + H2C2O4 --> FeC2O4 + H2SO4 + (NH4)HSO4 +6H20 Green --> Yellow * The beaker was then placed on a hot plate and slowly heated and stirred until it boiled. * The beaker was removed from the heat in order to allow the precipitate (Iron (II) Oxalate) to form at the bottom of the beaker. * The liquid was then decanted and 50 cm3 of deionised water was added to the remaining precipitate. ...read more.

Conclusion

* The crystals were weighed in a clock glass and then covered with filter paper and retuned to the cupboard. * Once dry, the crystals and clock were reweighed. * The percentage yield of hydrated Potassium Trioxalatoferrate was calculated. Hazards Eye protection was worn and if any chemicals were splashed onto skin it was washed off immediately. Cation was taken at all times to wear the safety equipment provided, in this case safety goggles and latex gloves. Name Hazard Hydrated Ammonium Iron (II) Sulphate Harmful if ingested and may irritate eyes Oxalic Acid Harmful if ingested and irritating to eyes and skin Potassium Oxalate Solution Harmful if ingested and irritating to eyes and skin Potassium Trioxalatoferrate Harmful if ingested and irritating to eyes and skin "20 Volume" Hydrogen Peroxide Irritating to eyes and skin Ethanol Harmful if ingested and irritating to eyes and skin, volatile, highly flammable Dilute Sulphuric Acid Corrosive ?? ?? ?? ?? ...read more.

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