The number of moles of needed to completely oxidize one mole of Copper(I) sulfide () in an acidic me — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$Cu_2S \rightarrow 2Cu^{2+} + SO_2$. $Cu$ goes from +1 to +2 (change = $1 \times 2 = 2$). $S$ goes from -2 to +4 (change = 6). Total n-factor for $Cu_2S$ = $2 + 6 = 8$. $KMnO_4$ in acidic medium has an n-factor of 5. By law of equivalence, $Moles_{KMnO4} \times 5 = 1 \times 8 \Rightarrow Moles_{KMnO4} = 8/5$.