Number of permanganate molecules required to oxidize one mole of thiosulphate ion in faintly alkaline or neural medium is

Question

TestHub · Accepted Answer

The balanced reaction in faintly alkaline or neutral medium is:

$8 MnO_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 MnO_{2} + 6 SO_{4}^{2 -} + 2 OH^{-}$

From the stoichiometry, 8 moles of $MnO_{4}^{-}$ oxidize 3 moles of $S_{2} O_{3}^{2 -}$ .

Therefore, for 1 mole of $S_{2} O_{3}^{2 -}$ , the moles of $MnO_{4}^{-}$ required are $8/3 = 2.67$ .

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