Answer: The concentration of gas in the solution has not changed after equilibrium is restored.
Step-by-step explanation:
The partial pressure of a gas over a solution is proportional to the concentration of the gas in the solution, according to Henry's law. If the partial pressure of the gas over the solution is tripled, then the concentration of the gas in the solution will also increase by a factor of three, assuming that the temperature remains constant.
However, when the partial pressure of the gas over the solution is increased, the system will shift to re-establish equilibrium. This means that some of the gas molecules will leave the solution and move into the gas phase until the partial pressure reaches a new equilibrium value. At this new equilibrium, the concentration of the gas in the solution will be the same as it was before the partial pressure was tripled, since the system has adjusted to the new conditions.
Therefore, the concentration of gas in the solution has not changed after equilibrium is restored.