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

💡 Solution & Explanation

$Cu_2S$ oxidizes to $Cu^{2+}$ and $SO_2$ . 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, $Moles_{KMnO4} \times 5 = 1 \times 8 \Rightarrow Moles_{KMnO4} = 8/5$ .