Molar conductivity of aqueous solution of `HA` is `200Scm^(2)mol^(-1),pH` of this solution is `4` Calculate the value of `pK_(a)(HA)` at `25^(@)C`. Given `^^_(M)^(oo)(NaA)=100scm^(2)mol^(-1),` `^^_(M)^(oo)(HCl)=425Scm^(2)mol^(-1),` `^^_(M)^(oo)(NaCl)=125 Scm^(2)mol^(-1)`
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