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(A) $ (A) $ The $pH$ of $1 	imes 10^{-8} \ M \ HCl$ is not $8$ because the contribution of $H^+$ ions from water cannot be neglected. The $pH$ is app

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$ (B), (C), (D) $

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(A) $ (A) $ The $pH$ of $1 	imes 10^{-8} \ M \ HCl$ is not $8$ because the contribution of $H^+$ ions from water cannot be neglected. The $pH$ is approximately $6.98$.$ (B) $ The conjugate base of $H_2PO_4^{-}$ is obtained by removing one $H^+$ ion,which gives $HPO_4^{2-}$. This is correct.$ (C) $ The auto-ionization of water is an endothermic process,so $K_w$ increases with an increase in temperature. This is correct.$ (D) $ According to the Henderson-Hasselbalch equation,$pH = pK_a + \log \frac{[Salt]}{[Acid]}$. At the half-neutralization point,$[Salt] = [Acid]$,so $pH = pK_a$. This is correct.

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