Which of the following statements is not corr | vedclass

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(C) $1$. $H_2PO_4^-$ acts as an acid to form its conjugate base $HPO_4^{2-}$,so option $A$ is correct.$2$. The ionic product of water $K_w = [H^+][OH^

Vedclass · Accepted Answer

The $pH$ of $10^{-8} \ M \ HCl$ is $8$

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(C) $1$. $H_2PO_4^-$ acts as an acid to form its conjugate base $HPO_4^{2-}$,so option $A$ is correct.$2$. The ionic product of water $K_w = [H^+][OH^-] = 10^{-14}$ at $298 \ K$,hence $pH + pOH = 14$ is correct.$3$. For a very dilute acid like $10^{-8} \ M \ HCl$,the contribution of $H^+$ from water cannot be ignored. The total $[H^+] = 10^{-8} + 10^{-7} \approx 1.1 	imes 10^{-7} \ M$. Thus,$pH = -\log(1.1 	imes 10^{-7}) \approx 6.96$,not $8$. Therefore,option $C$ is incorrect.$4$. The auto-ionization of water is an endothermic process. As temperature increases,$K_w$ increases,which leads to a decrease in the $pH$ of neutral water. Thus,option $D$ is correct.

Which of the following statements is not correct?

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