The sum of pH and pOH is equal to
Correct answer: B. 14
- A. 1
- B. 14
- C. 2
- D. 13
Explanation
In aqueous solutions at 25°C, the sum of pH and pOH is always 14. This is derived from the ion product of water (Kw), where Kw = [H+][OH-] = 1 × 10-14. Therefore, pH + pOH = -log(Kw) = 14. Option B is correct as it reflects this standard value. The other options are incorrect because they do not match the established relationship between pH and pOH in water at 25°C.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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