For the redox reaction , the values of and are: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$P^0 \rightarrow P^{+5}$ (loss of $5e^-$ per P, $20e^-$ per $P_4$). $N^{+5} \rightarrow N^{+4}$ (gain of $1e^-$). To balance electrons, 20 nitrate ions are needed per $P_4$. Balanced: $P_4 + 20HNO_3 \rightarrow 4H_3PO_4 + 20NO_2 + 4H_2O$. [1, 3]