Gce Model Questions Vol1 2024 Chemistry Question 22
Practice objective / multiple choice question 22 from the 2024 Gce Model Questions Vol1 Chemistry examination.
The dissociation of a weak carboxylic acid HA has a standard equilibrium constant \(K_a = 1.0\times10^{-5}\) at \(298\;\text{K}\). When the temperature is raised to \(318\;\text{K}\) the pH of a \(0.10\;\text{M}\) solution of HA changes from 3.00 to 2.80. Assuming the enthalpy change \(\Delta H^\circ\) for the dissociation is temperature‑independent over this range, calculate \(\Delta H^\circ\) in kJ mol\(^{-1}\) (to two significant figures).
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This is Gce Model Questions Vol1 2024 Chemistry Question 22. It is one of the objective questions from the 2024 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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