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

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(B) . Incorrect. For a very dilute acid solution $(1 	imes 10^{-8} \ M)$,the contribution of $H^{\oplus}$ from water cannot be ignored. The $pH$ will

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$B, C$

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(B) . Incorrect. For a very dilute acid solution $(1 	imes 10^{-8} \ M)$,the contribution of $H^{\oplus}$ from water cannot be ignored. The $pH$ will be slightly less than $7$,not $8$.$B$. Correct. The conjugate base is formed by the removal of a proton $(H^{\oplus})$: $H_2PO_4^{\ominus} ightarrow HPO_4^{2-} + H^{\oplus}$.$C$. Correct. The auto-ionization of water is an endothermic process; thus,$K_w$ increases as temperature increases.$D$. Incorrect. At the half-neutralization point of a weak acid titrated with a strong base,the Henderson-Hasselbalch equation gives $pH = pK_a + \log(\frac{[Salt]}{[Acid]})$. Since $[Salt] = [Acid]$,$pH = pK_a$.

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