Which of the following has the highest pH? | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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 $pH$?

Similar Questions

What is the percentage dissociation of $0.1 \ M$ acetic acid (in $\%$)? $(K_a = 10^{-5})$

The degree of dissociation of $0.1 \ M$ acid $HA$ is $5 \%$. The value of $K_c$ of $HA$ is

For the ionization of a weak acid $HA$ as $HA \rightleftharpoons H^{+} + A^{-}$,the $pH$ of a $1.0 \ M$ solution is $5$. The dissociation constant $K_a$ is:

$A$ monobasic weak acid dissociates to $1.2 \%$ in its $0.01 \ M$ solution at $298 \ K$. Calculate the dissociation constant of it.

$A$ weak monoacidic base is $1.2 \%$ dissociated in its $0.2 \ M$ solution. What is the value of dissociation constant?

Vedclass Test Series

Exam Paper Generator

Online Exam Module