KCET · Chemistry · Ionic Equilibrium
The aqueous solution of following salt will have the lowest \( \mathrm{pH} \) :
- A \( \mathrm{NaClO}_{3} \)
- B N aCl O
- C \( \mathrm{NaClO}_{2} \)
- D \( \mathrm{NaClO}_{4} \)
Answer & Solution
Correct Answer
(D) \( \mathrm{NaClO}_{4} \)
Step-by-step Solution
Detailed explanation
The pH of the aqueous solution of the following salts depend on corresponding acid.
\(\mathrm{NaClO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}\)
\(\mathrm{NaClO}_{4}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{4}\)
\(\mathrm{NaClO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{3}\)
\(\mathrm{NaClO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{2}\)
\(\mathrm{HClO}_{4}\) is the strongest acid, therefore, its salt solution will have the lowest pH value.
\(\mathrm{NaClO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}\)
\(\mathrm{NaClO}_{4}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{4}\)
\(\mathrm{NaClO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{3}\)
\(\mathrm{NaClO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH}+\mathrm{HClO}_{2}\)
\(\mathrm{HClO}_{4}\) is the strongest acid, therefore, its salt solution will have the lowest pH value.
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