What is the equivalent mass of potassium dichromate ( , molar mass = M) when it acts as an oxidizing — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

The reduction half-reaction for the dichromate ion in an acidic medium is $Cr_2O_7^{2-} + 14H^+ + 6e^- \rightarrow 2Cr^{3+} + 7H_2O$ . The oxidation state of Cr drops from +6 to +3. For two Cr atoms, the total electron gain is $2 \times 3 = 6$ . The n-factor is 6, making the equivalent mass M/6.