Which will make basic buffer ?

Question

1. 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH ₃ COOH 2. 100 mL of 0.1 M CH ₃ COOH + 100 mL of 0.1 M NaOH 3. 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH ₄ OH 4. 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH

Doubtly AI · Accepted Answer

Answer: 3. 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH ₄ OH A basic buffer is a weak base plus its salt (conjugate acid). (1) 5 mmol NaOH + 2.5 mmol acid: the 2.5 mmol of acid is neutralised, leaving strong base: not a buffer. (2) Equal amounts of acid and NaOH: only salt remains. (3) 10 mmol HCl + 20 mmol NH₄OH : 10 mmol NH₄Cl forms and 10 mmol NH₄OH is left: weak base + salt, a basic buffer. (4) Strong acid + strong base: just salt and water. Answer: option (3).

Which will make basic buffer ?

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