The equivalent weight of the complex salt when it acts as a reducing agent against is (where M is it — Redox Reactions and Volumetric Analysis Chemistry Question
Question
The equivalent weight of the complex salt $K_2C_2O_4 \cdot 3H_2C_2O_4 \cdot 4H_2O$ when it acts as a reducing agent against $KMnO_4$ is $M/x$ (where M is its molar mass). What is the value of $x$?
Answer: 8
💡 Solution & Explanation
The salt contains one $C_2O_4^{2-}$ unit from potassium oxalate and three $C_2O_4^{2-}$ units from oxalic acid, giving a total of 4 moles of oxalate ions per mole of the complex. Each oxalate ion loses 2 electrons during oxidation to $CO_2$. Total electrons lost = $4 \times 2 = 8$. Therefore, the n-factor $x = 8$.
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