Question

2. How do you think he increased the amount of carbon dioxide in the water?​

Answer 1

Answer:

Take a look at the curves for fractional amount in CO2-Water equilibrium curves. At acidic pH's, CO2 is freely existent in the water as aqueous CO2 gas in the solution. By increasing the temperature, CO2 solubility decreases and you can see CO2 gas bubbles on the surfaces of the water in your test container. Since, you are looking to conduct your experiment at high temperatrures with higher CO2 solubility (Which ends in higher bicarbonate ions or higher carbonate ions in the solution), you need to increase pH value and i think this is the only way.

But if you want to have higher temperatures and higher CO2 solubility in acidic conditions, i think it is impossible based on Henry's law for gas solubilities and also equilibrium curves for CO2-(HCO3-)-(CO3 2-) systems.