Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of NeutralisationHard2 minQB
ChemistryHardsingle choice
The enthalpy of neutralization of a strong monobasic acid by a strong monoacidic base is -13,700 cal. A certain monobasic weak acid is 20% ionized in a molar solution. If the enthalpy of ionization of the weak acid is +500 cal/mole, what is the enthalpy of neutralization of one molar solution of the weak acid?
Options:
Answer:
B
Solution:
The unionized fraction (80%) must be ionized during neutralization, costing 0.8 × 500 = 400 cal. Hence ΔHneut = -13,700 + 400 = -13,300 cal. This is option (b).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Neutralisation
⏱ 2mℹ️ Source: QB
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