AP EAMCET · Chemistry · Ionic Equilibrium
Weak acids are partially ionised in aqueous solutions. The ionisation constants of some acids are given below. Arrange these acids in increasing order of their acid strength
\begin{array}{cll}
\hline Index & \multicolumn{1}{c}{ Acid } & \multicolumn{1}{c}{\begin{array}{c}
Ionisation \\
constant
\end{array}} \\
\hline 1 & Formic acid (\mathrm{HCOOH}) & 1.8 \times 10^{-4} \\
\hline 2 & Hypochlorous acid (\mathrm{HClO}) & 3.0 \times 10^{-8} \\
\hline 3 & Nitrous acid \left(\mathrm{HNO}_2\right) & 4.5 \times 10^{-4} \\
\hline 4 & Hydrocyanic acid (\mathrm{HCN}) & 4.9 \times 10^{-10}
\end{array}
- A \(4 < 2 < 1 < 3\)
- B \(1 < 2 < 3 < 4\)
- C \(2 < 3 < 1 < 4\)
- D \(4 < 3 < 2 < 1\)
Answer & Solution
Correct Answer
(A) \(4 < 2 < 1 < 3\)
Step-by-step Solution
Detailed explanation
The relative strengths of acids may be determined by measuring their equilibrium constants in aqueous solutions. Stronger acids ionise to a greater extent. The larger the \(K_a\), of an acid, the larger the concentration of \(\mathrm{H}_3 \mathrm{O}^{+}\)and \(A^{-}\) relative…
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