Write a balanced equation for the reaction between the dichromate ion and iron (II) to yield...

Write a balanced equation for the reaction between the dichromate ion and iron (II) to yield iron (III) and chromium (III) in acidic solution.

Expert Solution

Cr2O7^2- (aq) + Fe^2+ (aq) ----------> Fe^3+ (aq) + Cr^3+ (aq)

Oxidation half reaction Reduction half reaction

Fe^2+ (aq) -----> Fe^3+ (aq) Cr2O7^2- (aq) -----> 2Cr^3+ (aq)

Fe^2+ (aq) -----> Fe^3+ (aq) Cr2O7^2- (aq) -----> 2Cr^3+ (aq)+7H2O

Fe^2+ (aq) -----> Fe^3+ (aq) Cr2O7^2- (aq) +14H^+(aq)-----> 2Cr^3+ (aq)+7H2O

Fe^2+ (aq) -----> Fe^3+ (aq) +e^- Cr2O7^2- (aq) +14H^+(aq)+6e^- -----> 2Cr^3+ (aq)+7H2O

6 Fe^2+ (aq) ----->6 Fe^3+ (aq) +6e^-

Cr2O7^2- (aq) +14H^+(aq)+6e^- -----> 2Cr^3+ (aq)+7H2O(l)

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Cr2O7^2- (aq) + 6Fe^2+ (aq) +14H^+(aq)-------> 6Fe^3+ (aq) + 2Cr^3+ (aq) + 7H2O(l)

queen_honey_blossom answered 2 years ago

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