Redox Principles - Balancing Half Reactions 1. Complete and balance the displaye

Question

Redox Principles - Balancing Half Reactions

1. Complete and balance the displayed half reaction in neutral aqueous solution taking into account the electrons.

Co2+(aq) ? Co3+(aq)

2. If the displayed half reaction in acidic aqueous solution is completed and balanced, click on the "Check Answer" button. If not, complete and balance it and then check your answer.

ClO3-(aq) ? Cl-(aq)

3. Complete and balance the displayed half reaction in acidic aqueous solution taking into account the electrons.

As(s) ? HAsO2(aq)

Explanation / Answer

(1) Co2+(aq) Co3+(aq)

The equation is balanced in Co atoms but not by charge

Balancing charge : Co2+(aq) Co3+(aq) +2e-

This is the balanced equation.

(2) ClO3-(aq) Cl-(aq)

Balance O atoms ( by adding H2O on deficient side) : ClO3-(aq) Cl-(aq) +3H2O (l)

Balance H atoms ( by adding H+ on deficient side) : ClO3-(aq)+6H+(aq) Cl-(aq) +3H2O (l)

Balance charge ( by adding electrons) : ClO3-(aq)+6H+(aq) +e- Cl-(aq) +3H2O (l)

This is the balanced equation.

(3) As(s) HAsO2(aq)

Balance O atoms ( by adding H2O on deficient side) : As(s)+2H2O(l) HAsO2(aq)

Balance H atoms ( by adding H+ on deficient side) : As(s)+2H2O(l) HAsO2(aq) +4H+(aq)

Balance charge ( by adding electrons) : As(s)+2H2O(l) HAsO2(aq) +4H+(aq)+4e-

This is the balanced equation.

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