The equivalent weight of in the reaction can be calculated as: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**Step 1:** In Pyrite ($FeS_2$), Fe is +2 and S is -1. <br>**Step 2:** $Fe^{+2} \rightarrow Fe^{+3}$ (loss of 1 $e^-$). <br>**Step 3:** $2S^{-1} \rightarrow 2S^{+4}$ (loss of $2 \times 5 = 10$ $e^-$). <br>**Total n-factor** = $1 + 10 = 11$. Eq. Wt = $M/11$. [2]