What is the pH of pure water at 25 °C?
Answer and explanation
Correct answer: B. 7
- Step 1: At , the autoionisation constant of water is .
- Step 2: In pure water, .
- Step 3: Compute pH: .
Answer
7.
Why not the others: The alternative options (0, 1, 14) correspond to incorrect stoichiometric ratios, wrong reaction intermediates, or arithmetic evaluation errors.
Practise more Equilibrium and kinetics.
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