What is the pH of 3.9×10^{- 4} M HNO₃?

Name: What is the pH of 3.9×10 - 4 M HNO 3 ?
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Question

Quizplus · Accepted Answer

The given compound, HNO₄, is nitric acid, which is a strong acid. Therefore, it completely dissociates in water, giving H⁺ ions and NO₄⁻ ions. The pH of the solution is equal to the negative logarithm of the H⁺ ion concentration. Using the given concentration of HNO₄:
pH = -log[H⁺]
[H⁺] = 3.9×10^(-4)
pH = -log(3.9×10^(-4))
pH = 3.41
Therefore, the correct answer is C.

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