What is the pH of pure water at 25 °C?
Answer and explanation
Correct answer: B. 7
- Step 1: Water undergoes autoionization according to the equilibrium , with autoionization constant at .
- Step 2: In pure water, stoichiometry dictates equal ion concentrations: .
- Step 3: The is calculated by taking the negative logarithm: .
Answer
7.
Why not the others: 0 represents a strongly acidic solution (); 1 represents a strong monoprotic acid solution; 14 represents a strongly basic solution ().
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