Which of the following form 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 solution is typically composed of a weak acid and its conjugate base (in the form of a salt). Each pair in the options includes a weak acid and its corresponding salt: acetic acid with sodium acetate, phosphoric acid with potassium dihydrogen phosphate, and formic acid with sodium formate. Therefore, all these combinations can form acidic buffers. Selecting 'All of these' as the correct answer is appropriate because every pair listed fulfills the criteria for forming an acidic buffer.
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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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