The enthalpy of neutralization of a strong monobasic acid by a strong monoacidic base is -13,700 cal. A certain monobasic weak acid is 10% ionized in a molar solution. If the enthalpy of ionization of

Question

The enthalpy of neutralization of a strong monobasic acid by a strong monoacidic base is -13,700 cal. A certain monobasic weak acid is 10% ionized in a molar solution. If the enthalpy of ionization of the weak acid is +400 cal/mole, what is the enthalpy of neutralization of one molar solution of the weak acid?

TestHub · Accepted Answer

Only the unionized fraction (90%) of the weak acid must be ionized during neutralization, costing 0.9 × 400 = 360 cal. Hence, Δ H neut = -13,700 + 360 = -13,340 cal. This corresponds to option (b).

Chemistry - Thermochemistry Question with Solution | TestHub

Options:

Doubts & Discussion