Which of the following has the highest pH? | vedclass

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(C) $pH$ is defined as $-\log[H^+]$. $A$ higher $pH$ corresponds to a lower concentration of hydrogen ions $[H^+]$.$1$. $0.1 \ M \ HCl$ is a strong ac

Vedclass · Accepted Answer

$0.1 \ M \ CH_3COOH$

Vedclass · Answer

(C) $pH$ is defined as $-\log[H^+]$. $A$ higher $pH$ corresponds to a lower concentration of hydrogen ions $[H^+]$.$1$. $0.1 \ M \ HCl$ is a strong acid,so $[H^+] = 0.1 \ M$,$pH = -\log(0.1) = 1$.$2$. $0.2 \ M \ HCl$ is a strong acid,so $[H^+] = 0.2 \ M$,$pH = -\log(0.2) \approx 0.7$.$3$. $0.15 \ M \ HNO_3$ is a strong acid,so $[H^+] = 0.15 \ M$,$pH = -\log(0.15) \approx 0.82$.$4$. $0.1 \ M \ CH_3COOH$ is a weak acid,so it dissociates partially. The $[H^+]$ will be much less than $0.1 \ M$ (specifically,$[H^+] = \sqrt{K_a 	imes C} \approx \sqrt{1.8 	imes 10^{-5} 	imes 0.1} \approx 1.34 	imes 10^{-3} \ M$).Since the $[H^+]$ for $CH_3COOH$ is the lowest,its $pH$ will be the highest $(pH = -\log(1.34 	imes 10^{-3}) \approx 2.87)$.Therefore,$0.1 \ M \ CH_3COOH$ has the highest $pH$.

Which of the following has the highest $pH$?

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