What is the pH of a 0.0072 M hydrochloric acid solution?
A)4.93
B)11.86
C)7.00
D)9.07
E)2.14

Question

Quizplus · Accepted Answer

Hydrochloric acid is a strong acid, meaning it dissociates completely in water. The equation for its dissociation is HCl → H+ + Cl-. Since it dissociates completely, we can assume that the concentration of H+ ions is equal to the concentration of the hydrochloric acid solution.

Therefore, pH = -log[H+]

pH = -log(0.0072) = 2.14

The answer is E.

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