When a solution of benzoic acid was titrated with NaOH , the pH of the solution when half of the acid neutralized was 4.2 ,What will be the dissociation constant of the acid ?
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Answer on the question #67074, Chemistry / Physical ChemistryQuestion:When a solution of benzoic acid was titrated with NaOH the pH of the solution half the acid neutralized was 4.2. what is dissociation constant of acidAnswer:According to Henderson-Hasselbach equation, pH and the dissociation constant of the weak acid are related as:+logDuring the titration, when half of the acid is neutralized, the ratio is equal to 1.This point in the titration is called half-equivalence point.Then, as the logarithm of 1 is zero, the pH at the half-equivalence point is equal to the pKa.Thus, pKaof weak acid is 4.2
Answer:According to Henderson-Hasselbach equation, pH and the dissociation constant of the weak acid are related as During the titration, when half of the acid is neutralized, the ratio is equal to 1.This point in the titration is called half-equivalence point.Then, as the logarithm of 1 is zero, the pH at the half-equivalence point is equal to the pKa.Thus, pKaof weak acid is 4.2
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