1.

Which one of the following mixtures is suitable for making a buffer solution will an optimum pH of 9.2 - 9.3 ?

Answer»

`CH_3CO_2Na//CH_3CO_2H (K_a = 1.8 xx10^(-5))`
`NH_3//NH_4Cl (K_a(NH_4^(+))=5.6 xx10^(-10)) `
`NaNO_2//HOCl(K_a = 4.5 xx10^(-8))`
`NaNO_2//HNO_2(K_a = 4.5xx10^(-4))`

ANSWER :B


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