Acidic buffer can be prepared by mixing:
Correct answer: B. Weak acid and strong base
- A. Weak acid and weak base
- B. Weak acid and strong base
- C. Strong acid and strong base
- D. Strong acid and weak base
Explanation
An acidic buffer resists changes in pH and is prepared using a weak acid and its salt. Mixing a weak acid with a strong base produces the salt of the weak acid, which together with the remaining weak acid forms a buffer. Thus, an acidic buffer is made from a weak acid and strong base.
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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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