Balance the following equations in basic medium by ion-electron method and oxidation number methods and identify the oxidising agent and the reducing agent.

$$Cl_{ 2 }O_{ 7 \; (g) } \; + \; H_{ 2 }O_{ 2 \; (aq) } \; \rightarrow \; ClO^{ – }_{ 2 \; (aq) } \; + \;O_{ 2 \; (g) } \; + \; H^{ + }_{ (aq) }$$

Asked by Pragya Singh | 1 year ago |  65

Solution :-

The Oxidation no. of Cldecreases from +7 in $$Cl_{ 2 }O_{ 7 }\;to +3$$ in $$ClO_{ 2 }^{ – }$$

The oxidation no. of Oincreases from $$-1\; in\; H_{ 2 }O_{ 2 }$$to 0 in $$O_{ 2 }$$

Therefore, $$H_{ 2 }O_{ 2 }$$​behaves as a reducing agent while $$Cl_{ 2 }O_{ 7 }$$​ behaves as an oxidizing agent in the reaction. Ion – electron method:

– The oxidation half reaction:

$$H_{ 2 }O_{ 2 \; (aq) } \; \rightarrow \; O_{ 2 \; (g) }$$

By adding two electrons to the oxidation number, the oxidation number is balanced as follows:

2OH - ions are added to balance the charge as follows:

By adding $$2H_2 O_2$$ as follows, the oxygen atoms are balanced.

The half-reduction equation is as follows: The Cl atoms are balanced in the following way:

$$Cl_{ 2 }O_{ 7 \; (g) } \; \rightarrow \; ClO^{ – }_{ 2 \; (aq) }$$

By adding 8 electrons to the oxidation number, the oxidation number is balanced:

$$Cl_{ 2 }O_{ 7 \; (g) } \; + \; 8\; e^{ – } \; \rightarrow \; 2 \; ClO^{ – }_{ 2 \; (aq) }$$

6OH' is added to balance the charge as follows:

By adding $$3H_2O$$ as follows, the oxygen atoms are balanced.

By multiplying equation (i) by 4 and adding equation (ii) toit, you can get the balanced equation.

Oxidation number method:

– Reduction in the oxidation no. of $$Cl_{ 2 }O_{ 7 }$$ = 4× 2 = 8

– Increment in the oxidation no. of $$H_{ 2 }O_{ 2 }$$​ = 2× 1 = 2

Multiply $$H_{ 2 }O_{ 2 }$$​ by 4 and $$O_{ 2 }$$by 4 to balance the reduction and increment of the oxidation no. :

The Cl atoms are balanced in the following way:

The O atoms are balanced by adding $$3 H_2O$$ in the following way:

$$2OH^{-}$$and $$2H_2O$$are used to balance the H atoms as follows:

This is the equation that must be balanced.

Answered by Abhisek | 1 year ago

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