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Potassium Permanganate

In a neutral ...

Question

In a neutral or faintly alkaline solution, 8 moles of permanganate anion quantitatively oxidized thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is

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Solution

$8 M n O_{4}^{-} (a q) + H_{2} O (l) + 3 S_{2} O_{3}^{- 2} (a q) \to 8 M n O_{2} (s) + 3 S O_{4}^{- 2} (a q) + 3 S O_{4}^{- 2} (a q) + 2 O H^{- 1}$

$∴$ 8 moles $M n O_{4}^{-}$ produces 6 moles $S O_{4}^{2 -}$
NOTE:
$8 K M n O_{4} (a q) + H_{2} O (l) + 3 N a_{2} S_{2} O_{3} (a q) \to 8 M n O_{2} (s) + 3 N a_{2} S O_{4} (a q) + 3 K_{2} S O_{4} (a q) + 2 K O H (a q)$

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