23.
A 0.02 M acid HA is 40% dissociated. The
equilibrium constant ka for the acid is
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Answer:
Acid -base reaction is as follows:
HA+H
2
O→H
3
O
+
+A
−
Given, degree of dissociation (α)=40%=0.4
For weak acid, hydronium ion concentration is
[H
3
O
+
]=Cα=0.2×0.4=0.08
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