Which buffer solution has maximum pH?

1.	Which buffer solution has maximum pH?
Answer» mixture which is 0.1 M in `CH_3 COOH and 0.1 Mis CH_3 COONa [pK_a (CH_3COOH )= 4.74` mixture which is `0.2 M CH_3 COOH and 0.2 M is CH_3 COONa` mixture which is `0.1 M ` in ` NH_4 Cl and 0.1 M `in `NH_4 OH [pK_a (NH_4^(+)) =9.26]` all the solution have EQUAL pH which is `4.74` Solution :( a ) ` pH =pKa +log ""(0.1)/(0.1)=4.74` ( B ) ` pH =pKa +log ""(0.2)/(0.2)=4.74` ( C ) ` pH =pKa +log ""(0.1)/(0.1)=9.26`

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