Chemistry Practice Problems Balancing Redox Reactions Practice Problems Solution: When the reaction, Cl2(aq) → Cl -(aq) + ClO 3 -(aq...

Solution: When the reaction, Cl2(aq) → Cl -(aq) + ClO 3 -(aq) is balanced in aqueous basic solution, what is the coefficient of H 2O? a. 3 b. 5c. 7d. 2e. 4

Problem

When the reaction, Cl2(aq) → Cl -(aq) + ClO 3 -(aq) is balanced in aqueous basic solution, what is the coefficient of H 2O? 

a. 3 

b. 5

c. 7

d. 2

e. 4

Solution

We're being asked to determine the coefficient of water in the balanced redox basic reaction of :

Cl2(aq) → Cl -(aq) + ClO 3 -(aq)


A redox reaction can be balanced (in basic solution) by these steps:

Step 1: Separate the whole reaction into two half-reactions.

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

Step 3: Balance oxygen by adding H2O to the side that needs oxygen. (1 O: 1 H2O)

Step 4: Balance hydrogen by adding H+ to the side that needs hydrogen. (1 H: 1 H+)

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