Question

(a) Which gas is dissolved in soft drinks?
(b) What will you do to increase the solubility of this gas?

Answer 1

Hint:
As we know that when we open a bottle of soft drink the effervescence comes out. This is due to the gas present in soft drinks. There are some gases which are soluble in liquid because these are chemically similar. If we increase the temperature of any solution or any substance that will cause increase in mobility of particles and the particles are now more active.

Complete step by step solution
(a) Carbon dioxide is dissolved in soft drinks. The greater the solubility of carbon dioxide in a solvent is due to the chemical similarity between the solvent and the carbon dioxide gas.
(b)There are some factors by which we can increase the solubility of gas-
- Effect of pressure- according to Henry’s law, the mass of the gas dissolved in a given volume of the liquid at constant temperature is directly proportional to the pressure of the gas present in the liquid.
\[
{\rm{m \, \alpha \, p}}\\
{\rm{m = Kp}}
\]
Where, \[{\rm{m}}\] is the mass of the gas.
\[{\rm{K}}\] Is the proportionality constant.
\[{\rm{p}}\] is the pressure of the gas.
As we increase the pressure the solubility of the gas increases in the liquid
- Effect of temperature- The solubility of gas increases with decrease in temperature. The dissolution of gas in liquid is an exothermic as we can see below-
So, according to Le Chatelier’s principle, if we decrease the temperature equilibrium shifts toward right.

Note:
There are some applications of Henry’s law.
- The scuba divers always carry cylinders filled with air diluted with helium to avoid bends. When air enters the lungs, partial pressure of oxygen is high. Thus, oxygen is released from oxyhaemoglobin which is utilised for function of the cell.