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Questions  

The Ka for formic acid  and  acetic acid are 2 × 10-4 and 2 × 10-5 respectively. Calculate the relative strength of acids with same molar concentration

a
10:1
b
7:1
c
8:1
d
5:1

detailed solution

Correct option is A

[H+] =KaC Relative strength of weak acids = Ka1Ka2 × C1C2∴    Relative strength = Ka1Ka2               ∵    C1 =C2                             =2 × 10-42 × 10-5 Relative strength for HCOOH to CH3COOH = 10 : 1

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