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Question
The hydrolysis constant of the salts NaA and NaB [of two weak acids HA and HB] are 10−8 and 10−10 respectively. If the dissociation constant Ka of weak acid HC is 10−5, then decreasing order of the acid strength would be -
The hydrolysis constant of the salts NaA and NaB [of two weak acids HA and HB] are 10−8 and 10−10 respectively. If the dissociation constant Ka of weak acid HC is 10−5, then decreasing order of the acid strength would be -
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Solution
The correct option is A HB>HC>HA
Ka=KwKh
SoKHA=10−1410−8=10−6
KHB=10−1410−10=10−4
KHC=10−5
So order of strength is HB>HC>HA
Ka=KwKh
So
KHA=10−1410−8=10−6
KHB=10−1410−10=10−4
KHC=10−5
So order of strength is
HB>HC>HA
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