Balance each redox reaction using the half-reaction method. Express your answer

Question

Balance each redox reaction using the half-reaction method. Express your answer as a chemical equation. Identify all the phases in your answer. 1. Zn(s)+Sn^2(aq)--->Zn^2+(aq)+Sn(s)

Explanation / Answer

Since there are no other atoms involved ,this can be balanced by just balancing the charges For that add 2e- to the product side ,so that the net charge us zero on either side ie Mg --> Mg2+ + 2e- Reduction half Cr3+ --> Cr To balance charge add 3e- to reactant side ie Cr3+ + 3e- --> Cr In any redox reaction the number of electrons involved in the reduction half and oxidation half should be equal To make them equal multiply the oxdn half by 3 and redn half by 2 (Mg --> Mg2+ + 2e-)X 3 = 3Mg --> 3Mg 2+ + 6e- (Cr3+ + 3e- --> Cr) X 2 = 2Cr3+ + 6e- --> 2Cr

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