When carbon dioxide gas dissolves in water, it forms a weakly acidic solution. The hydrogen ion concentration in solution depends on the amount of dissolved carbon dioxide. In the Equilibrium in a Syringe: Solubility of CO2—ChemTopic™ Lab Activity, study the effect of pressure and temperature changes on the solubility of carbon dioxide and the position of equilibrium in this reversible reaction. Available as part of the Exploring Equilibrium—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.