10. Which of the following is the pH of a solutionobtained by mixing 50.0 ml of

Question

10. Which of the following is the pH of a solutionobtained by mixing 50.0 ml of 0.100 M HA and 50.0 ml of 0.100 MNaOH?

I. Neutral if HA is a strong acid
II. Acidic if HA is a strong acid
III. Neutral if HA is a weak acid
IV. Basic if HA is a weak acid: *

Ionly

II only

III only

IV only

I and III

II and IV

I and IV

II and III

10. Which of the following is the pH of a solutionobtained by mixing 50.0 ml of 0.100 M HA and 50.0 ml of 0.100 MNaOH?

I. Neutral if HA is a strong acid
II. Acidic if HA is a strong acid
III. Neutral if HA is a weak acid
IV. Basic if HA is a weak acid: *

Ionly

II only

III only

IV only

I and III

II and IV

I and IV

II and III

Explanation / Answer

50.0 ml of 0.100 M HA and 50.0 ml of 0.100 M NaOH NaOH is a strong base. So we if take equal volumes andstrenghts of NaOH and a strong acid HA, pH will be 7 because theywill be at equivalence point. i.e solution will be neutral. So 1 is correct. 2 is wrong. If HA is weak, then the resulting solution will be basicbecause, weak acids do not dissociate completely. So 3 is wrong and 4 is correct. So[I and IV ] is the answer.

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