Which of the following statement(s) is(are) c | vedclass

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(B, C) Statement $A$ is incorrect because for a very dilute acid solution, the contribution of $H^+$ ions from water cannot be neglected. The $pH$ of

Vedclass · Accepted Answer

The conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$

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(B, C) Statement $A$ is incorrect because for a very dilute acid solution, the contribution of $H^+$ ions from water cannot be neglected. The $pH$ of $1.0 	imes 10^{-8} \ M$ $HCl$ is approximately $6.98$, not $8$.Statement $B$ is correct because the conjugate base is formed by the removal of one proton $(H^+)$ from the acid: $H_2PO_4^- ightarrow H^+ + HPO_4^{2-}$.Statement $C$ is correct because the autoprotolysis of water is an endothermic process $(\Delta H > 0)$, so the equilibrium constant $K_w$ increases with an increase in temperature.Statement $D$ is incorrect because at the half-neutralization point of a weak acid, the concentration of the acid equals the concentration of its conjugate base $([HA] = [A^-])$. According to the Henderson-Hasselbalch equation, $pH = pK_a + \log(\frac{[A^-]}{[HA]})$, which simplifies to $pH = pK_a$.

Which of the following statement(s) is(are) correct?

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