To balance the given oxidation-reduction reaction:
Cr2O72-(aq) + Cu+(aq) → Cr3+(aq) + Cu2+(aq)
Step 1: Separate the whole reaction into two half-reactions:
Cr2O72-(aq) → Cr3+ (aq) Cu+(aq) → Cu2+(aq)
Step 2: Balance the non-hydrogen and non-oxygen elements first:
Cr2O72-(aq) → 2Cr3+ (aq) Cu+(aq) → Cu2+(aq)
(Cr: balanced) (Cu: balanced)
Balance each of the following redox reactions occurring in acidic solution. Express your answer as a chemical equation. Identify all of the phases in your answer.
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