Question

What is meant by aqueous tension? How is the pressure exerted by a gas corrected to account for aqueous tension?

Answer 1

The partial pressure due to the water vapor mixed with a gas measured over water. It is definite for each temperature. Some gases are collected over water in the laboratory. The gas during collection gathers water vapors and become moist. The pressure exerted by this moist gas is, therefore, the sum of the partial pressures of the dry gas and that of water vapors. The partial pressure exerted by the water vapors is called aqueous tension.

$P_{\text{moist}}=P_{\text{dry}}+P_{\text{water vapour}}$

$P_{\text{water vapour}}=\text{aqueous tension}$