State Henry's law for slubility of a gas in a liquid. Explain the significance of Henry's law constnat `(K_(H)).` At the same temperatue, hydrogen is more soluble in water than helium. Which of them will have a higer value of `K_(H) ` and Why?

Explanation

Henry.s law states that the solubility of a gas in liquid at a given temperature is directly proportional to the partial pressure of the gas.
`P _(k _(H)x`
where P is the pressure of the gas, x is the mole fraction of the gas in the solution and `K_(H)` is the Henry.s law constant. `K_(H)` is a function of the nature of gas. Higher the value of `K_(H)` at a given temperature, lower is the solubility of the gas in the liquid.
As helium is less soluble in water, so it has a higher value of `K_(H)` than hydrogen.
Henry.s Law: As dissolution of agar in liquid is an exothermic process, therefore, the solubility should decrease with in increase in temperature.