allerypH of pure water at 25 °C is:
A1
B7
C14
D0
Answer & Solution
Correct answer: B. 7
1. Pure water: [H⁺] = [OH⁻] = 10⁻⁷ M.
2. pH = −log [H⁺] = −log 10⁻⁷ = 7 (neutral).
3. pH < 7 = acidic; pH > 7 = basic.
_Source: syllabus Science Ch 2 §2.2 pH Scale_
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