25 ml of a weak acid, HA required 15 ml of 0.1 M NaOH for the end point. During titration, the pH of the acid

### Question Asked by a Student from EXXAMM.com Team

Q 1119523419.     25 ml of a weak acid, HA required 15 ml of 0.1 M NaOH for the end point. During titration, the pH of the acid solution is found to be 5.70 upon the addition of 10 ml of the above alkali. Find the pK_a of the weak acid.

A

5.90

B

6.40

C

7.30

D

5.40

#### HINT

Use pH = pK_a + log(([A^−])/([HA]))

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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