Which of the following statement(s) is/are correct? (A) The pH of M HCl solution is 8. (B) The conjugate base of is . (C) increases with increase in temperature. (D) When a solution of a weak monoprotic acid is titrated against a strong base at hal

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Solution

Q.
Which of the following statement(s) is/are correct

(A) The pH of $1 \times 10^{- 8}$ M HCl solution is 8.

(B) The conjugate base of $H_{2} {PO}_{4}^{-}$ is ${HPO}_{4}^{2 -}$ .

(C) $K_{w}$ increases with increase in temperature.

(D) When a solution of a weak monoprotic acid is titrated against a strong base at half neutralisation point, $pH = \frac{1}{2} p K_{a} .$

Choose the correct answer from the options given below: [2023]

1 (B), (C)

2 (A), (D)

3 (B), (C), (D)

4 (A), (B), (C)

Ans.
(1)

(A) pH of $10^{- 8}$ M HCl ranges 6.98.

(B) The conjugate base of $H_{2} {PO}_{4}^{-}$ is ${HPO}_{4}^{2 -}$ .

(C) $K_{w}$ increases with increase in temperature. As the temperature increases, the dissociation of water increases.

(D) At half neutralisation point, half of the acid is present in the form of salt. So it forms an acidic buffer solution.

$pH = p^{k a} + \log \frac{[salt]}{[acid]}$

$pH = p^{k a} + \log \frac{1}{1}$

$pH = p^{k a} .$

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