Balance the following oxidation-reduction equations. Thesereactions occur in a b

Question

Balance the following oxidation-reduction equations. Thesereactions occur in a basic solution.
a)      Co2+ +H2O2 --> Co(OH)3 +H2O
b)      Cr(OH)4- +H2O2 --> CrO42-+ H2O c)      Zn +NO3- --> NH3 +Zn(OH)42- I know how to separate them into two different equations but Iam confused on where to add the water, hydrogen andelectrons. Can someone please show me how to work these. Balance the following oxidation-reduction equations. Thesereactions occur in a basic solution.
a)      Co2+ +H2O2 --> Co(OH)3 +H2O
b)      Cr(OH)4- +H2O2 --> CrO42-+ H2O c)      Zn +NO3- --> NH3 +Zn(OH)42- I know how to separate them into two different equations but Iam confused on where to add the water, hydrogen andelectrons. Can someone please show me how to work these. I know how to separate them into two different equations but Iam confused on where to add the water, hydrogen andelectrons. Can someone please show me how to work these.

Explanation / Answer

(a) Co2+ + 2 OH- => Co(OH)2 2H2O2 => 2H2O + O2 charges balanced so no need to add electrons Co2+ + 2 OH- + 2H2O2 =>Co(OH)2 + 2H2O + O2

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