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Pure water has a pH of 7.0. However, normal rain is slightly acidic because carbon dioxide (CO2) dissolves into it forming weak _______ acid, giving the resulting mixture a pH of approximately 5.6 at typical atmospheric concentrations of CO2.

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Answer:

Carbonic

Explanation:

Rain water is slightly acidic with a pH of 5.6. This happens due to the rain water reacting to atmospheric Carbon dioxide in atmospheric concentrations.

H20+ CO2= H2CO3 (carbonic acid)

The Hydrogen ions in the H2CO3 ( weak Carbonic acid) makes the water acidic. This explains the reason why rain water is referred to as acidic water.

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