General Knowledge - Chemistry - Discussion

Henry's law is one of the gas laws formulated by William Henry in 1803. It states:

"At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid."

An equivalent way of stating the law is that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.
An everyday example of Henry's law is given by carbonated soft drinks. Before the bottle or can of carbonated drink is opened, the gas above the drink is almost pure carbon dioxide at a pressure slightly higher than atmospheric pressure.

The drink itself contains dissolved carbon dioxide. When the bottle or can is opened, some of this gas escapes, giving the characteristic hiss (or "pop" in the case of a sparkling wine bottle). Because the partial pressure of carbon dioxide above the liquid is now lower, some of the dissolved carbon dioxide comes out of solution as bubbles.

If a glass of the drink is left in the open, the concentration of carbon dioxide in solution will come into equilibrium with the carbon dioxide in the air, and the drink will go "flat".

According to Henry's law at constant temperature the solubility of gas in liquid is proportional to the partial pressure of the gas.

i.e. At constant temperature increasing the partial pressure will increase the amount of dissolved gas.

Partial pressure of the gas = KC.
partial pressure of the gas = KX.

K = Henry's constant.
X = mole fraction of the gas in liquid.

Daltons law of partial pressure it states ; when two or more gases which do not react chemically, are kept in a closed space, the total pressure exerted by the mixture is equal to the sum of partial pressure of individual gases.

At a constant temperature, the amount of a gas dissolves in a volume of liquid is directly proportional to the partial pressure of the gas in equilibrium with that liquid.

So, the correct answer is C.

Henry's law may also be states as:

The solubility of a gas in liquid at a particular temperature is directly proportional to the pressure of the gas in equilibrium with the liquid at that temperature.

At a constant temperature, the amount of a given gas dissolved in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.

Solubility of gas is directly proportional to the partial pressure of the gas which exerts on the liquid surface. This statement is called Henery law. Hence option 'C' is correct.

The mass of a gas dissolved per unit volume of a solvent is directly proportional to the pressure of a gas in equilibrium with the solution at constant temperature.

The mass of gas (m) dissolved in given volume of liquid at a constant temperature is directly proportional to the pressure (p) of the gas.

The solubility of a gas in a liquid is directly proportional to the pressure of the gas.