Final answer:
option c,To calculate the Henry's Law constant for CO₂(aq), the partial pressure of the gas needs to be measured in addition to its concentration in the solution.
Step-by-step explanation:
To calculate the Henry’s Law constant (kH) for CO₂(aq), you need to measure the partial pressure of the gas. Henry's Law states that the concentration of a dissolved gas in a liquid is directly proportional to the partial pressure of that gas above the liquid. The formula for Henry's Law is C = kP, where C is the concentration of dissolved gas at equilibrium, P is the partial pressure of the gas, and k is the Henry's Law constant. The volume of the solvent, atmospheric pressure, or vapor pressure of water are not necessary for determining the Henry's Law constant in this case.
The additional quantity that must be measured in order to calculate the Henry’s Law constant for the gas is the partial pressure of the gas. According to Henry's Law, the concentration of a gas in a solution is directly proportional to its partial pressure. The Henry's Law constant, represented by the symbol kH, is the proportionality constant that relates the concentration of the gas to its partial pressure. In order to determine kH, you need to measure the concentration of CO₂(aq) in the solution at equilibrium as well as the partial pressure of CO₂ in the system.