Why is sodium metabisulphite a better reducing agent than ferrous sulphate for Cr(VI) reduction?

29 February 2020 1 2K Report

I am looking for a reason as so what makes the sodium metabisulphite reduce Cr(VI) efficiently

Hi Bharti Verma, in my opinion the reason is that the sulfur-sulfur bond in the anion [O2S–SO3]2– is rather long and labile. The closely related dithionite anion, [O2S–SO2]2– is known to be strongly reducing, because it can dissociate into [SO2]2–. radical anions. I assume that the same can happen to the disulfite (= metabisulphite) anion.

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