Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain pressure of dry gas?

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Solution

Whenever a gas is collected over water, it is moist and saturated with water vapours which exert their own pressure. The pressure due to water vapours is called aqueous tension. Thus, the total pressure of the gas (p moist gas) is

$P_{m o i s t g a s} = P_{d r y g a s}$ + aqueous tension

Thus, $P_{d r y g a s}$ is given as

$P_{d r y g a s} = P_{m o i s t g a s}$ - aqueous tension

Hence, the correction term applied to the total pressure of the gas in order to obtain the pressure of a dry gas is p moist gas -aqueous tension.

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