Question $12$

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Given $0\mathrm{.}01M$ solutions of each of the following acids, which solution would have the lowest $pH?$

Hypoiodous acid $($HOI$),K_a=2\mathrm{.}3{10}^{-11}$

Hypobromous acid $(HOBr),K_a=2\mathrm{.}5{10}^{-9}$

Lactic acid $(H{C}_3{H}_5{O}_3),K_a=1\mathrm{.}3{10}^{-4}$

Chlorous acid $(HCl{O}_2),K_a=1\mathrm{.}1{10}^{-2}$