Question

State Henry's law. What is the effect of temperature on the solubility of a gas in a liquid?

Answer 1

Henry's law states that the solubility of a gas in a liquid at constant temperature is proportional to the pressure of the gas above the solution. If S is the solubility of the gas (unit M or mol/L) and P is the pressure of a gas (unit atm), then
$S\propto P$
$S=KP$
Here K is the Henry's law constant with units M/atm.
The effect of temperature on the solubility of a gas in a liquid:
According to Charle's law, volume of a given mass of a gas increases with increase in temperature. The volume of given mass of dissolved gas in solution also increases with increase of temperature. It becomes impossible for solvent to accommodate gaseous solute in it and gas bubbles out. Hence, with increase in temperature, the solubility of a gas in a liquid decreases.