Question

Identify the option(s), which is/are not correct with respect to solubility of a gas in water.

• A. Value of $K_H$ (Henry's constnt) will decrease as the temperature increases
• B. Value of $K_H$ (Henry's constant ) at the same temparature for $O_2$ gas will be less as compared to $H_2$ gas
• C. Soft drinks will have greater "fizz" if sealed under low pressure
• D. Scuba divers, when they move underwater, will have increased solubility of gases in their blood

Answer 1

Answer: (A), (C)

Soft drinks will have greater "fizz" if sealed under low pressure

Henry 's equation :
$P=k_{H}C$ or
$K_H\propto \frac{1}{\text{solubility}}$
$P=\text{partial pressure of gas}$
$K_H=\text{Henry's constant}$
$C=\text{Concentration of gas}$

(A) $K_H$ is temparature dependent, as temperarture increases $K_H$ will increases.

(B) Since at the same temperature, solubility of $O_2$ is more, so $K_H$ will be less while solubility of $H_2$ is less so $K_H$ will be more .
Correct statement

(C) Soft drinks contain $C{O}_2$ gas, which gives them "Fizz" when bottle is opened. So, soft drinks are sealed under higher pressure.
Because if we don't maintain the pressure, the $C{O}_2$ comes out of the solution and escapes to the atmosphere.

(D) Underwater as the pressure increases, the solubility of gases in the diver's blood stream increases. So, when scuba diver move underwater, the solubility of gasses in their blood increases.