`{:(CH_(3)COOH,hArr,CH_(3)COO^(-),+,H^(+),),(0.1 M,,0M,,0M,"प्रारम्भ में "),((0.1-x)M,,xM,,xM,"साम्यवास्था"):}`
`K_(A) = ([CH_(3)COO^(-)] xx [H^(+)])/([CH_(3)COOH])`
या `1.8 xx 10^(-5) = (x xx x)/((0.1 - x) ) ~~ (x^(2))/(0.1)`
या `1.8 xx 10^(-6) = x^(2)`
या `x = 1.34 xx 10^(-3) M`
या`[H^(+)] = 1.34 xx 10^(-3) M`