Which of the following can form an acidic buffer?
Correct answer: D. All of these
- A. Acetic acid / sodium acetate
- B. Phosphoric acid / potassium dihydrogen phosphate
- C. Formic acid / sodium formate
- D. All of these
Explanation
An acidic buffer is a mixture of a weak acid and its conjugate base (usually from a salt). All three options consist of a weak acid and its corresponding salt, so all of them will form acidic buffer solutions.
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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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