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General Chemistry

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Acid-base Equilibrium

Question
1 out of 10
 

If the pH of a solution is 2.5, what is the concentration of H3O+ in that solution?

A 2.9 x 10–1
B 3.2 x 10–3
C 3.8 x 10–2
D 6.3 x 10–5
Ans. B This question tests your understanding of the concept of pH. You also have to use some mathematical skill to answer this question, since you are not allowed to use a calculator.

pH = – log [H+]

To get the hydrogen ion (hydronium or H3O+) concentration, we have to take the antilog. If the pH were 2, the molar concentration would have been 10–2. If the pH were 3, the molar concentration would have been 10–3. Since the pH is 2.5, the best choice is 3.2 x 10–3.

Acid-base Equilibrium Flashcard List

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