You have 100.0 mL of a solution of hydrochloric acid that has a pH of 3.00.You add 100.0 mL of water to this solution.What is the resulting pH of the solution?
A)The pH = 5.00 (the average of 3.00 and 7.00).
B)The pH = 10.00 (3.00 + 7.00 = 10.00).
C)The pH = 3.00 (water is neutral and does not affect the pH).
D)None of the above is correct,but the pH must be greater than 3.00.
E)None of the above is correct,but the pH must be less than 3.00.

Question

Quizplus · Accepted Answer

Adding water to an acidic solution will dilute the acid, decreasing its concentration and pH. However, adding water does not change the value of the acid dissociation constant (Ka) for hydrochloric acid. Therefore, the resulting pH will be less than 3.00, but not as low as pH 1.00, which would represent a hydrochloric acid solution of double strength. The exact pH value of the resulting solution can be calculated using the dilution equation and the Ka value for hydrochloric acid.

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