Question

The largest value of Henry's law constant for the liquid solvent H${}_2$O will be obtained with ............. gas as the solute and a temperature of .............. ${}^o$C.

• A. $C_2{H}_4,45$
• B. $Ar,11$
• C. $HCl,49$
• D. $C{O}_2,32$

Answer 1

The correct option is A $C_2{H}_4,45$

According to Henry's law, $P=KS$
S is the solubility in moles per liter
K is Henry's law constant
P is the pressure in atm.

When the temperature is higher, the solubility of gas will be lower and for a given value of partial pressure, the value of Henry's law constant will be higher.

Thus the largest value of Henry's law constant will be at maximum temperature i.e ${49}^{o}C$ but HCl is polar and dissociate as ions in water so it cannot be the answer.

Also, the value is maximum for $C_2{H}_4$ gas as it has the lowest solubility in water.