What is the pH of 10.0 mL of 0.0020 M HCl
A) 0.70
B) 2.70
C) 3.70
D) 5.70
E) 10.0

Question

Quizplus · Accepted Answer

HCl is a strong acid, which means that it completely dissociates in water to form H+ ions and Cl- ions. The concentration of H+ ions in the solution will be equal to the concentration of the HCl solution.

pH is defined as the negative logarithm (base 10) of the concentration of H+ ions.

pH = -log[H+]

pH = -log(0.0020 M)

pH = 2.70

Therefore, the pH of 10.0 mL of 0.0020 M HCl is 2.70.

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