The buffer solution is not formed for:
Correct answer: D. HCl + NaCl
- A. NH4OH + NH4Cl
- B. CH3COOH + CH3COONa
- C. C6H5COOH + C6H5COONa
- D. HCl + NaCl
Explanation
For the formation of a buffer, there should be a weak acid OR a weak base together with its salt. Since option D has a strong acid (HCl) and its salt (NaCl), a buffer solution can not be formed with this combination. Option A has a weak base and its salt. Options B and C have weak acids and their salts. These combinations can form buffer solutions so, they are not correct options.
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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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