On the basis of the equation pH = - log [H+ ], the pH of 10-8 mol dm-3 solution of HCl should be 8. However, it is observed to be less than 7.0. Explain the reason.

Answers (1)

As per the information given in the question, we can determine that the solution will be extremely dilute. It is also known to us that when HCl reacts with water it forms hydronium ion.

Thus, the large concentration of (H+) as a result, contributes to a decrease in the pH. Thus, here we cannot afford to ignore the concentration of H3O+ ions in the solution.

So, the total pH will be; [H_{3}O^{+}] = 10^{-8} + 10^{-7} M \approx 7

Therefore, the solution will be acidic.

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