Balancing Redox Reactions Video Lessons

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Problem: Complete and balance the following equations.Cr2O2−7(aq)+I−(aq)→Cr3+(aq)+IO−3(aq) (acidic solution)Express your answer as a chemical equation. Identify all of the phases in your answer.

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To balance the given oxidation-reduction reaction (acidic solution):

Cr2O72–(aq) + I(aq) Cr3+ (aq)+ IO3(aq)


Step 1: Separate into two half-reactions:

Cr2O72– Cr3+                                                         I(aq) IO3(aq)


Step 2: Balance the non-hydrogen and non-oxygen elements first:

Cr2O72– 2Cr3+                                                        I(aq) IO3(aq)

(Cr: balanced)                                                                           (I: balanced)

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Problem Details

Complete and balance the following equations.

Cr2O2−7(aq)+I−(aq)→Cr3+(aq)+IO−3(aq) (acidic solution)

Express your answer as a chemical equation. Identify all of the phases in your answer.

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