Bufferis a solutionwhosepH doesnot changesignificantlyon addition of a small amountof acidoraikali or no dilution . Answerthefollowingquestions : The ratio of pH(approximately ) of aolution(I) containing 1 moleof CH_(3)COONaand 1moleof HCl nd solution(II) containing1 moleof CH_(3)COONaand 1 moleof aceticacidin one litreis :

Bufferis a solutionwhosepH doesnot changesignificantlyon addition of a

1.	Bufferis a solutionwhosepH doesnot changesignificantlyon addition of a small amountof acidoraikali or no dilution . Answerthefollowingquestions : The ratio of pH(approximately ) of aolution(I) containing 1 moleof CH_(3)COONaand 1moleof HCl nd solution(II) containing1 moleof CH_(3)COONaand 1 moleof aceticacidin one litreis :
Answer» `1:2` `2:1` `1:3` `3:1` SOLUTION :Solution (I) `to {:(CH_(3)COONa,+,HCL,to,CH_(3)COOH,+,NaCl),(1,,1,,0,,0),(0,,0,,1,,1):}` ` :. [CH_(3)COOH]= ("No of moles ")/("Volume of solution ") = 1/1= 1 ` ` [H^(+)]= C propsqrt((K_(a))/C ) = SQRT(K_(a)C) = sqrt(K_(a))` i.e`pH_(1) = -1/2 logK_(a) = 1/2 pK_(a)` SLOUTION `to{:(CH_(3)COONa,+,CH_(3)COOH),(1,,1):}` `pH_(2) =pK_(a) +log. 1/1` `pH_(2) = pK_(a)` ` :. (pH_(1))/(pH_(2)) = 1/2`