You are given a sealed container of water and air. The Pco2 and Po2 in the air are both 100 mmHg.

Question

1. What percentage of CO2 will dissolve in water?

2. What is the Pco2 in the water?

3. What percentage of O2 will dissolve in water?

4. What is the Po2 in water?

5. Which gas has more molecules dissolved in the water?

6. What does Daltons law of gases say about changing the volume of a container of gas?

7. If you decrease the volume of the sealed container, what will happen to the Po2 in the air in the container?

8. At this Po2(from question 7). what will be the Po2 in the water for the smaller volume?

Answer 1

1. The solubility of CO2 in water is dependent on temperature, pressure, and pH. At 100 mmHg, approximately 0.47% of CO2 will dissolve in water.
2. Using Henry's law, the Pco2 in water can be calculated based on the solubility of CO2 in water. At 100 mmHg in the air, the Pco2 in the water would be approximately 0.47 mmHg.
3. Similar to CO2, the solubility of O2 in water is dependent on temperature, pressure, and other factors. At 100 mmHg, approximately 0.21% of O2 will dissolve in water.
4. Using Henry's law, the Po2 in water can be calculated based on the solubility of O2 in water. At 100 mmHg in the air, the Po2 in the water would be approximately 0.21 mmHg.
5. At the same temperature and pressure, the amount of molecules dissolved in water is proportional to the solubility of the gas. Since the solubility of CO2 is higher than that of O2, more CO2 molecules will dissolve in the water.
6. Dalton's law of gases states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each gas in the mixture. This means that if the volume of a container of gas changes, the pressure of the gas mixture will change proportionally.
7. If the volume of the sealed container is decreased, according to Boyle's law, the pressure of the gas mixture in the container will increase. Therefore, the Po2 in the air in the container will increase.
8. Using Henry's law, the Po2 in the water will also increase proportionally to the increase in the Po2 in the air. Therefore, if the Po2 in the air in the container increases by a certain percentage, the Po2 in the water will also increase by the same percentage.