Solutions and Colligative Properties 1 Question 6
7. Which one of the following statements regarding Henry’s law is not correct?
(2019 Main, 8 Jan I)
(a) Different gases have different $K_{\mathrm{H}}$ (Henry’s law constant) values at the same temperature
(b) Higher the value of $K_{\mathrm{H}}$ at a given pressure, higher is the solubility of the gas in the liquids
(c) The value of $K_{\mathrm{H}}$ increases with increase of temperature and $K_{\mathrm{H}}$ is function of the nature of the gas
(d) The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution
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Solution:
- At constant temperature, solubility of a gas $(S)$ varies inversely with Henry’s law constant $\left(K_{\mathrm{H}}\right)$
$$ K_{\mathrm{H}}=\frac{\text { Pressure }}{\text { Solubility of a gas in a liquid }}=\frac{P}{S} $$
Thus, higher the value of $K_{\mathrm{H}}$ at a given pressure, the lower is the solubility of the gas in the liquid.
