Q.
The dissociation constant (Ka) and percent of degree of dissociation (α) of a weak monobasic acid solution of 0.1M with a pH = 5 are respectively.
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a
10-9, 1
b
10-9, 10-4
c
10-9, 10-2
d
10-5, 10-2
answer is C.
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Detailed Solution
H+=Coα=KαCo ⇒10-5=10-1×α ⇒α=10-4Also; Ka=Coα2=10-9Percentage degree of dissociation =α×100%=10-2%
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