Any one knows why we have to add tartaric acid to a solution of Fe
2+/Fe
3+and neutralize it with ammonia before adding any KCN?
I'm guessing it has something to do with the pH change involved after adding KCN, since CN
- would hydrolyse water (correct me if i'm wrong =x), so a buffer solution is needed, but this seems a bit farfetched..hope someone knows the answer