The pKa of a certain weak acid is 4.0. What should be the [salt] to [acid] ratio if we have to prepare a buffer with pH = 5 using the acid and one of the salts?
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a
10 : 1
b
1 : 10
c
4 : 5
d
5 : 4
answer is A.
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Detailed Solution
pKa of weak acid =4.0 We know that, pH=pKa+log[ salt ][ acid ] pH=5,pKa=4,5=4+1,log[ salt ][ acid ]=1 ∴ [ salt ][ acid ]=101