Which one of the following acids has the highest pH value?
Correct answer: C. HF(aq)
- A. HCl(aq)
- B. HNO₃(aq)
- C. HF(aq)
- D. H₂SO₄(aq)
Explanation
pH is a measure of acidity; a higher pH means a weaker acid. Among the choices, hydrofluoric acid (HF) is the weakest acid. The others are strong acids that dissociate more completely, leading to lower pH values.
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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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