Transition elements
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What is the purple intermediate formed when sodium thiosulphate and iron(III) chloride are added together?
180309
Corrie writes ....
Information on this is hard to find but it would appear, from one reference I managed to locate via Google, that the purple colour is due a complex ion formed between Fe3+ ions and thiosulphate ions. Evidence seems to suggest that it is a 1:1 complex, with the formula [Fe(S2O3]+, excluding the water molecules also attached to the Fe3+ ion.
Hope this helps?
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updated: 19 March 2009
