It's difficult to give a single number for how much more acidic acid rain is than distilled water because:

* Acid rain has a range: The pH of acid rain varies depending on the pollutants present and the location.

* Distilled water is neutral: It has a pH of 7, which is considered neutral.

* The pH scale is logarithmic: A decrease of one pH unit represents a tenfold increase in acidity.

Here's a general idea:

* Normal rainwater: Slightly acidic, around pH 5.6 due to dissolved carbon dioxide.

* Acid rain: Can range from pH 4 to 5 or even lower.

* Comparison: Acid rain with a pH of 4 is 100 times more acidic than distilled water (pH 7). Acid rain with a pH of 5 is 10 times more acidic than distilled water.

Key takeaway: Acid rain is significantly more acidic than distilled water, and the difference in acidity can be substantial depending on the specific pH of the acid rain.