How is air dissolved in water different from ordinary air ?

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Solution

We know ordinary air is mainly composed of three gases such as nitrogen (78%), oxygen (21%) and carbon dioxide (0.03%).

Water can dissolve gases like oxygen and nitrogen to a small extent due to which amount of these gases dissolved in water will be little as compared to present in the ordinary air.

Water can dissolve $C O_{2}$ to a greater extent due to the formation of carbonic acid $H_{2} C O_{3}$ .

So, water contains $C O_{2}$ gas more than nitrogen and oxygen gases.

As a result, air dissolved in water contains $C O_{2}$ gas in greater amount and nitrogen, oxygen gases in lesser amount while ordinary air contains nitrogen, oxygen gases in greater amount and $C O_{2}$ in the lesser amount.

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