MHT CET · Chemistry · Ionic Equilibrium
Which among the following salts turns blue litmus red in its aqueous solution?
- A \(\mathrm{NH}_4 \mathrm{CN}\)
- B \(\mathrm{NH}_4 \mathrm{~F}\)
- C \(\mathrm{CH}_3 \mathrm{COONa}\)
- D \(\mathrm{CH}_3 \mathrm{COONH}_4\)
Answer & Solution
Correct Answer
(B) \(\mathrm{NH}_4 \mathrm{~F}\)
Step-by-step Solution
Detailed explanation
In acidic solution blue litmus paper turns red.
* \(\mathrm{NH}_4 \mathrm{~F}\) is a salt of weak acid \(\mathrm{HF}\left(\mathrm{K}_{\mathrm{a}}=7.2 \times 10^{-4}\right)\) and weak base \(\mathrm{NH}_4 \mathrm{OH}\left(\mathrm{K}_{\mathrm{b}}=1.8 \times 10^{-5}\right) \cdot \mathrm{K}_{\mathrm{a}}>\mathrm{K}_{\mathrm{b}}\) the solution of \(\mathrm{NH}_4 \mathrm{~F}\) will be acidic in nature.
* \(\mathrm{NH}_4 \mathrm{CN} \rightarrow\) Basic solution
\(* \mathrm{CH}_3 \mathrm{COONa} \rightarrow\) Basic solution
\(* \mathrm{CH}_3 \mathrm{COONH}_4 \rightarrow\) Neutral solution.
* \(\mathrm{NH}_4 \mathrm{~F}\) is a salt of weak acid \(\mathrm{HF}\left(\mathrm{K}_{\mathrm{a}}=7.2 \times 10^{-4}\right)\) and weak base \(\mathrm{NH}_4 \mathrm{OH}\left(\mathrm{K}_{\mathrm{b}}=1.8 \times 10^{-5}\right) \cdot \mathrm{K}_{\mathrm{a}}>\mathrm{K}_{\mathrm{b}}\) the solution of \(\mathrm{NH}_4 \mathrm{~F}\) will be acidic in nature.
* \(\mathrm{NH}_4 \mathrm{CN} \rightarrow\) Basic solution
\(* \mathrm{CH}_3 \mathrm{COONa} \rightarrow\) Basic solution
\(* \mathrm{CH}_3 \mathrm{COONH}_4 \rightarrow\) Neutral solution.
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