According to Henry’s Law ‘The partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas in solution.’ The correct statement about Henry’s constant is:

• A. Higher the value of K_H at a given pressure, higher is the solubility of the gas.
• B. Higher the value of K_H at a given pressure, lower is the solubility of the gas.
• C. K_H is not a function of the nature of gas.
• D. K_H value for all the gases is the same at a given pressure.

Henry's Law describes the relationship between the pressure of a gas and its solubility in a liquid. The constant associated with this law, known as Henry's constant (K_H), provides insight into how gases behave in solutions.

Understanding Henry's Constant

Henry's constant varies for different gases and is influenced by factors such as temperature and the nature of the gas itself.

Evaluating the Statements

• A: This statement is incorrect. A higher K_H indicates lower solubility.
• B: This statement is correct. A higher K_H at a given pressure means the gas is less soluble in the liquid.
• C: This statement is misleading. K_H does depend on the nature of the gas.
• D: This statement is false. K_H values differ for different gases at the same pressure.

Conclusion

The correct answer is B: Higher the value of K_H at a given pressure, lower is the solubility of the gas.