Explain the pH difference between acid rain and pure water.

Pure water has a pH of 7, and, generally, rainfall is somewhat on the acidic side (a bit less than 6). But, acid rain can have a pH of about 5.0-5.5, and can even be in the 4 range in the northeastern United States, where there are a lot of industries and cars.

Explanation:

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the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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- lead + phosphoric acid = hydrogen + lead(ii) phosphate