Question

# The dissociation constants  of two acids HA1 and HA2  with equal concentrations are 3×10−4 and 1.8×10−5 respectively. The relative strength of the acids will be :

A
1:4
B
4:1
C
1:16
D
16:1

Solution

## The correct option is D 4:1Given,  Ka1(HA1)=3×10−4,Ka2(HA2)=1.8×10−13  The formula to calculate the relative strength of a weak acid is : [HA]=√Ka×C The ratio of stregnth of two given acids with equal concentrations is [HA1][HA2]=√Ka1×CKa2×C[HA1][HA2]=√Ka1Ka2=√3×10−41.8×10−5[HA1][HA2]=√16.71=41 So , the ratio of strength of two acids are [HA1]:[HA2]=4:1Chemistry

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