Unit 1 PPA - Prep of Potassium trioxalatoferrate (III)

Note by , created almost 6 years ago

A-Levels Chemistry (PPA's) Note on Unit 1 PPA - Prep of Potassium trioxalatoferrate (III), created by snowred-orange on 05/05/2013.

Eye 523
Pin 0
Balloon left 0
Created by snowred-orange almost 6 years ago
Chemistry General Quiz - 2
Chemistry Quiz General -3
AS Chemistry - Enthalpy Changes
Sarah H-V
GCSE AQA Chemistry - Unit 1
James Jolliffe
Salesforce Admin 201 Exam Chunk 1 (1-30)
Brianne Wright
Acids and Bases quiz
Derek Cumberbatch
Using GoConqr to study science
Sarah Egan
Acids and Bases
Sarah Egan
Ionic Bondic Flashcards.

Page 1

Aim  - prepare crystals of the above compound and calc the %yield

Method -Hydrated ammonium iron (II) sulphate contains pale green Fe2+ ion.This is reacted with oxalic acid.When heated, brown precipitate appears - iron(II)oxalate.Precipitate filtered off.Precipitate treated with hydrogen peroxide + potassium oxalate solution (both colourless).Hydrogen peroxide oxidises iron(II) ---> iron (III). Potassium trioxalatoferrate(III) and dark brown iron(III)hydroxide precipitate produced.More oxalic acid added, coverts solid precipitate to more potassium trioxalatoferrate.Resulting green solution filtered, left in dark cupboard. Lime green crystals appear in few days.

Evaluation - ( why yield wasn't 100% )Complex reactions - some reached equilibrium rather then completionSide reactions may have occurredImpurities in initial reactantsMass transfer lossLosses during crystallisation - some product remains in solution.

New Page