Question

Choose the incorrect statement:

• A. Higher the $K_H$ value for a gas at a given pressure, higher is its solubility in that solvent.
• B. $K_H$ value for a gas present in a given solvent depends on the nature of solute and solvent.
• C. $K_H$ value is temperature dependent.
• D. $K_H$ value changes with change in the partial pressure of the gas.

Hint:

Remember, according to Henry's Law, solubility is inversely proportional to $K_H$ and directly proportional to the partial pressure of the gas.

Answer 1

The Correct Option is A

The $K_H$ (Henry’s Law constant) is defined as the ratio of the partial pressure of a gas to its concentration in a solution, i.e., \[ K_H = \frac{P}{C} \] where \(P\) is the partial pressure and \(C\) is the concentration of the gas in solution. - Statement A is incorrect because Henry’s Law constant, $K_H$, increases with decreasing solubility. This means that a higher $K_H$ corresponds to lower solubility, not higher. - Statement B is correct because $K_H$ depends on the nature of the solvent and solute. - Statement C is correct since the value of $K_H$ changes with temperature. As temperature increases, the solubility of gases typically decreases, which leads to a change in $K_H$. - Statement D is correct because according to Henry’s Law, the concentration of gas in the solution is directly proportional to the partial pressure, so the $K_H$ value changes with changes in partial pressure.