It is found that at 25,text{°C},0.1,M solutio | vedclass

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(B) The $pH$ of a salt solution depends on the strength of the parent acid and base. For a salt of a strong base and a weak acid,the $pH$ is greater t

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$HA$

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(B) The $pH$ of a salt solution depends on the strength of the parent acid and base. For a salt of a strong base and a weak acid,the $pH$ is greater than $7$. As the $pH$ of the salt solution increases,the strength of the corresponding acid decreases. Given $pH$ values: $NaA = 7$,$NaB = 9$,$NaC = 10$,$NaD = 11$. Since $NaA$ has a $pH$ of $7$,it is a salt of a strong acid and a strong base. Since $NaB$,$NaC$,and $NaD$ have $pH > 7$,they are salts of a strong base and a weak acid. Among the given acids,$HA$ is the strongest because its salt $NaA$ is neutral $(pH = 7)$,whereas the others form basic solutions.

It is found that at $25\,\text{°C}$,$0.1\,M$ solutions of four sodium salts $NaA$,$NaB$,$NaC$,and $NaD$ have the $pH$ values $7$,$9$,$10$,and $11$ respectively. Which one of the corresponding acids is the strongest?

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