-factor of in the reaction is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$H_3PO_4$ is a tribasic acid. In this specific reaction, it loses 2 protons to form $HPO_4^{2-}$ (leaving one $H$ attached). The number of replaceable $H^+$ ions actually replaced is 2. Thus, $n$-factor = 2.