Which of the following solutions has the high | vedclass

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(D) The $pH$ of a solution is defined as $pH = -\log[H^+]$.$HClO_4$ is a strong acid,so $[H^+] = 0.2 \, M$,$pH = -\log(0.2) \approx 0.7$.$CH_3COOH$ is

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$0.2 \, M \, NaCl$

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(D) The $pH$ of a solution is defined as $pH = -\log[H^+]$.$HClO_4$ is a strong acid,so $[H^+] = 0.2 \, M$,$pH = -\log(0.2) \approx 0.7$.$CH_3COOH$ is a weak acid,so $[H^+]  0.7$.$HCl$ is a strong acid,so $[H^+] = 0.020 \, M$,$pH = -\log(0.020) \approx 1.7$.$NaCl$ is a salt of a strong acid and a strong base,which is neutral in aqueous solution,so its $pH = 7$.Since $7 > 1.7 > 0.7$,the solution with the highest $pH$ is $0.2 \, M \, NaCl$.

Which of the following solutions has the highest $pH$?

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