Q.
From the following tableWhich of the two sets of buffer solutions have least pH ?
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a
I and II
b
I and III
c
II and III
d
II and IV
answer is B.
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Detailed Solution
PH of an acidic buffer is given by, PH=PKa+log[ salt ][ acid ]I.PH=PKa+log4×0.14×0.1=PKaII.PH=PKa+log40×0.14×0.1=PKa+1III.PH=PKa+log4×0.140×0.1=PKa-1IV·PH=PKa+log10×0.10.1×0.1=PKa+2
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