The enthalpy of neutralization of a strong monobasic acid by a strong monoacidic base is –13,700 cal — Thermodynamics and Thermochemistry Chemistry Question
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?
Answer: B
💡 Solution & Explanation
Since 10% is already ionized, 90% remains to be ionized during neutralization. The heat consumed for this ionization is $0.9 \times 400 = +360\text{ cal}$. The net enthalpy of neutralization is $-13700 + 360 = -13340\text{ cal}$.
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