The enthalpy of neutralization of a weak monoprotic acid (HA) in 1M solution with a strong base is –55.95 kJ/mol. If acid HA requires 1.4 kJ/mol heat for it’s complete ionization and enthalpy of neutralization of the strong monobasic acid with a strong monoacidic base is –57.3 kJ/mol. What is the % ionization of the weak acid in molar solution ?
Text Solution
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HA — → H + + A – ; Δ r H = 1.4 kJ/mol
Δ H neutralization = Δ H ionization + Δ r H of (H + + OH – 
Η 2 Ο)
– 55.95 = Δ H ionization – 57.3
Δ H ionization for 1 M HA = 1.35 kJ/mol
% heat utilized by 1 M acid for ionization = 
× 100 = 96.43%
So, acid is 100 – 96.43 = 3.57% ionized.
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