The value of base ionisation constant Kb is calculated using the following formula,
Kb=KaKwwhere,
Ka is the acid dissociation constant
Kw is water dissociation constant
We are given,
Ka= 4.4∗10−7
Kw=1.0∗10−14
Substituting
Kb=4.4∗10−71.0∗10−14
=2.3∗10−8
Kb for conjugate base of carbonic acid=2.3∗10−8
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