Question

When CO2 is introduced into aerated drinks and sealed, what is the nature of the graph between partial pressure of CO2 and its concentration in the drink?

(a) Exponentially increasing

(b) Positive slope

(c) Negative slope

(d) Constant

This question was posed to me in semester exam.

I would like to ask this question from Solubility Solutions in section Solutions of Chemistry – Class 12

Answer 1

Correct option is (b) Positive slope

Easy explanation: CO2 obeys Henry’s law, which governs the solubility of gases in liquids in relation to its pressure. Henry’s law states that mole fraction of gas in the solution varies directly with its partial pressure over the surface i.e. p ∝ x (mole fraction). The graph is of the form y = mx, a positively sloped straight line passing through the origin.