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K(a) for butyric acid is 2.0xx10^(-5). C...

`K_(a)` for butyric acid is `2.0xx10^(-5)`. Calculate pH and hydroxyl ion concentration in `0.2M` aqueous solution of sodium butyate.

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The correct Answer is:
9
`{:(,NaBu+,H_(2)O hArr,NaOH+,BuH),("Conc. before hydrolysis",1,,0,0),("Conc. after hydrolysis",1-h,,h,h):}`
`:. [OH^(-)] = C.h Csqrt((K_(h))/(C)) = sqrt(K_(h).C) = sqrt((K_(w).C)/(K_(a)))`
`[OH^(-)] = (10^(-14) xx 0.2)/(2 xx 10^(-5)) = sqrt(10^(-10)) = 10^(-5)`
`:. pOH = -log[OH^(-)] = 5` and so pH = 14 - 5 = 9
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