Final answer:
The solubility of CaCO3 in rainwater (pH = 5.8) is determined by the presence of dissolved CO2, which forms carbonic acid. As the pH decreases, the solubility of CaCO3 increases. Therefore, the solubility of CaCO3 in acid rain (pH = 4.24) would generally be higher compared to that in rainwater with a pH of 5.8.
Step-by-step explanation:
The solubility of CaCO3 in rainwater (pH = 5.8) is determined by the presence of dissolved CO2, which forms carbonic acid. The reaction between water and carbon dioxide results in the formation of carbonic acid:
H2O + CO2 → H2CO3
This carbonic acid reacts further with CaCO3 as follows:
CaCO3 + H2CO3 → Ca2+ + 2HCO3-
As the pH decreases (i.e., acidity increases), the solubility of CaCO3 increases. Therefore, the solubility of CaCO3 in acid rain (pH = 4.24) would generally be higher compared to that in rainwater with a pH of 5.8.