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Question

The enthalpy of neautralization of a weak monoprotic acid (HA) in 1M solution with a strong monoacidic base is 55.95 kJ/mol. If the unionized acid requires 1.4 kJ/mol heat for its complete ionization and enthalpy of neutralization of the strong monobasic acid with a strong monoacidic base is 57.3 kJ/mol. What is the percentage ionization of the weak acid in molar solution? (Put your answer upto two decimal points)

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Solution

Given, the enthalpy of neutralization of the strong monobasic acid with a strong monoacidic base is 57.3 kJ/mol

Again, the enthalpy of neautralization of a weak monoprotic acid with a strong monoacidic base is 55.95 kJ/mol.

So the energy used for diisociation of week acid is (57.355.95) kJ/mol=1.35 kJ/mol

But, the heat required for complete ionization of weak monobasic acid is 1.4 kJ/mol

So the percentage ionization of the weak acid =1.41.351.4×100=3.571%

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