Question

Henry’s law constant for carbon dioxide at 38°C is 0.00228 mol L-1 atm-1. Calculate the pH of a solution of carbon dioxide at 38°C in equilibrium with the gas at a partial pressure of 3.20 atm

Answer 1

First calculate the molar concentration of CO2by  using the Henry’s law.



Here, k is the Henry law constant and P is the partial pressure of CO2.



The carbonate ion reacts with water to produce HCO3−, which is the conjugate base of H2CO3. Construct an equilibrium table for each ionization, using x as the unknown in the first ionization and y as the unknown in the second ionization.
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