Anhydrous oxalic acid H2C2O4 (molar mass 90 g mol^-1) is oxidised to CO2 by KMnO4. Its equivalent mass is:

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Anhydrous oxalic acid $H X_{2} C X_{2} O X_{4}$ (molar mass $90 g mo l^{- 1}$ ) is oxidised to $CO X_{2}$ by $KMnO X_{4}$ . Its equivalent mass is:

Carbon changes from

+ 3

+ 4

in each of two carbon atoms, so

n = 2

per molecule. Equivalent mass

= 90/2 = 45

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