Question

Complete and balance the following half reactions. In each case indicate whether oxidation or reduction occurs....

Complete and balance the following half reactions. In each case indicate whether oxidation or reduction occurs.

Co2+(aq) --> Co3+(aq)

H2O2(aq) --> O2(g) acidic solution

ClO3-(aq) --> Cl-(aq) acidic solution

OH-(aq) --> O2(g) basic solution

SO32-(aq) --> SO42-(aq) basic solution

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Answer #1

Co+2(aq)   ---------> Co+3(aq) + e-      oxidation

H2O2(aq)    ------------> O2(g) + 2H+(aq)   + 2e-    oxidation

ClO3-(aq) + 6e- +   6H+ -----------> Cl- + 3H2O    reduction

4OH-(aq)    ------> O2(g)   + 4e- + 2H2O    oxidation

SO3-2(aq) + 2OH- ----------> SO4-2(aq)   + 2e- + H2O     oxidation

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