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.

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.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

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