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The solubility of carbon dioxide in a soft drink falls as temperature rises because dissolving is:
Aexothermic, so heat drives the gas out
Bendothermic, so heat drives the gas out
Cexothermic, so heat pulls more gas in
Dunaffected by heat but changed by pressure
Answer & Solution
Correct answer: A. exothermic, so heat drives the gas out
1. Dissolving a gas in a liquid releases heat, so the process is exothermic.
2. Write it as: CO₂(g) + water ⇌ CO₂(aq) + heat.
3. Raising the temperature adds heat, which is on the product side.
4. By Le Chatelier's principle the system shifts backwards to remove that heat, releasing gas.
5. So less carbon dioxide stays dissolved, which is why a warm drink goes flat faster.
_Source: NECTA ACSEE 2023 Chemistry 132/1, Question 8: Chemical Equilibrium_
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