CH3CH2OH(aq) + Cr2O72?(aq) ----> CH3COOH(aq) + Cr3+(aq) Solution CH3CH2OH(aq) +

Question

CH3CH2OH(aq) + Cr2O72?(aq) ----> CH3COOH(aq) + Cr3+(aq)

Explanation / Answer

CH3CH2OH(aq) + Cr2O72?(aq) ----> CH3COOH(aq) + Cr3+(aq) ANSWER: CH3CH2OH(aq) + 4OH- CH3COOH(aq) +3H2O + 4e- ----------(1) Cr2O7^2-(aq) + 7H2O + 6 e- 2Cr3+(aq) + 14OH- ------------(2) (1) x 3, 3CH3CH2OH(aq) + 12OH- 3CH3COOH(aq) +9H2O + 12e- ----------(3) (2) x 2, 2Cr2O7^2-(aq) + 14H2O + 12 e- 4Cr3+(aq) + 28OH- -------------(4) Add (3)and (4), 3CH3CH2OH(aq) + 2Cr2O7^2-(aq) + 5 H2O 3CH3COOH(aq) + 4Cr3+(aq) + 16OH- (OR) 3CH3CH2OH(aq) + 2Cr2O7^2-(aq) + 5 H2O 3CH3COOH(aq) + 4Cr(OH)3(aq) + 4OH-

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