Question

Solubility of a gas in water depends on
(A) Nature of gas
(B) Temperature
(C) Pressure of the gas
(D) All the above

Answer 1

Hint: Solubility is the process or the property of matter (such as solid, liquid, or gas) that helps them dissolve in another state of matter (such as solid, liquid, or gas) called solvent. Therefore, a substance is said to be soluble if it dissolves in a given solvent. Thus, we can say salt is soluble in water and solubility is the property of salt (or solute). Also, there are some factors affecting the solubility depending upon which state the solute is in.

Complete Step by Step Solution:
The solubility of a gas depends on various factors depending upon which state the solute is in. The solubility of a gas in water depends on the temperature, the partial pressure of the gas over the liquid, the nature of the water and also on the nature of the gas.

Henry's constant ${K_H} = \dfrac{1}{K}$ ​ where $K$ is the constant of proportionality whose value is dependent on the nature of the gas, the nature of solvent and also on the temperature. The solubility of any gas in a given liquid is the volume of the gas in cc that can dissolve in a unit volume of the liquid to form the saturated solution at the required temperature and under the pressure of $1$ atm.
Therefore, option D is the correct answer.

Note: Henry's constant is the function of the nature of the gas. The higher the value of${K_H}$, lower is the value of solubility of the gas at the same partial pressure at a particular temperature. The value of ${K_H}$​ rises with the rise in temperature implying that the solubility decreases with the rise in the temperature at the same pressure.