A closed bottle of carbonated water at 4 °C is allowed to warm to 25 °C while the cap…
CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A closed bottle of carbonated water at 4 °C is allowed to warm to 25 °C while the cap remains sealed. The equilibrium of interest is CO₂(g) ⇌ CO₂(aq). As the temperature rises, the solubility of CO₂ in water decreases. Which of the following best explains the direction of the net conversion that occurs while the bottle is warming?
(a) CO2(g)⟶CO2(aq) because the higher temperature gives gas molecules more kinetic energy, producing more collisions with the water surface.
(b) No net conversion occurs because the forward and reverse rates increase by the same factor when the temperature increases.
(c) CO2(aq)⟶CO2(g) because the reverse rate becomes greater than the forward rate as the temperature rises.
(d) CO2(aq)⟶CO2(g) because the forward rate decreases relative to the reverse rate with increasing temperature.