Chemical amounts (A2)
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I am doing a back titration to find out the concentration of an aqueous solution of chlorine using ammonium iron(II) sulphate. Should the ammonium iron(II) sulphate be acidifed or does that have no bearing on the results?
Since you are doing a redox titration the quantity of acid present does not affect the result.
The reason for making up the solution of ammonium iron(II) sulphate in acid conditions is that it helps to limit oxidation of iron(II) to iron(III) by oxygen in the air.
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updated: 07 April 2005
