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Structure of Glucose

C2O42- can be...

Question

C₂O₄^2- can be oxidized to CO₂ by MnO₄^- in acidic as well as in basic medium. What is ratio of moles of MnO₄^- used per mole of C₂O₄^2- in acidic medium(Mn²⁺) to strong basic medium(MnO₄^2-) ?

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Solution

$I n a c i d i c m e d i u m 5 C_{2} {O_{4}}^{2 -} + 2 M n {O_{4}}^{-} + 16 H^{+} \to 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O F o r 5 m o l e s o f o x a l a t e 2 m o l e s o f m a n g a n a t e i s u s e d . S o f o r 1 m o l e o f o x a l a t e = \frac{2}{5} \times 1 = \frac{2}{5} m o l e s o f m a n g a n a t e i s u s e d . I n b a s i c m e d i u m 3 C_{2} {O_{4}}^{2 -} + 2 M n {O_{4}}^{-} + 4 H_{2} O \to 2 M n O_{2} + 6 C O_{2} + 4 O H^{-} F o r 3 m o l e s o f o x a l a t e 2 m o l e s o f m a n g a n a t e i s u s e d . S o f o r 1 m o l e o f o x a l a t e = \frac{2}{3} \times 1 = \frac{2}{3} m o l e s o f m a n g a n a t e i s u s e d . T h u s t h e r a t i o o f m a n g a n a t e u s e d p e r m o l e o f o x a l a t e i s = \frac{\frac{2}{5}}{\frac{2}{3}} = 3 : 5$

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