Answer: Water ionisation is endothermic.
- A Water ionisation is exothermic
- B Water ionisation is endothermic
- C Kw is independent of temperature
- D Temperature reduces ion mobility
Correct answer: B. Water ionisation is endothermic
Explanation: The ionisation of water is endothermic. Increasing temperature shifts equilibrium right, increasing Kw above 10⁻¹⁴.
As the reaction proceeds, reactant concentration falls and product concentration rises until both level off at equilibrium.
Concept context
When forward and reverse reaction rates are equal, equilibrium is reached. Learn about Kc, Kp, Le Chatelier's principle, and acid-base equilibria, including pH, buffer solutions, and solubility product.