Which acid among the following has the highest $\mathrm{p} K_a$ value?
Which acid among the following has the highest $\mathrm{p} K_a$ value?
- $\mathrm{HCl}$
- $\mathrm{HF}$
- \(\mathrm{HI}\)
- \(\mathrm{HBr}\)
Solution
\(\mathrm{HF}\left(\mathrm{p} K_a=3.1\right)\)
\(\begin{aligned}
\operatorname{HCl}\left(\mathrm{p} K_a\right. & =-6.0) \\
\operatorname{HBr}\left(\mathrm{p} K_a\right. & =-9.0) \\
\operatorname{HI}\left(\mathrm{p} K_a\right. & =-9.5) .
\end{aligned}\)
Therefore, HF has highest \(\mathrm{p} K_a\) value. Hence, the correct option is (b).
Asked in: AP EAMCET 2020 (21 Sep Shift 1)
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