Question

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1) Which of the following aqueous solutions are good buffer systems?( can be more than one)

0.17 M sodium hydroxide + 0.23M sodium bromide

0.34 M barium perchlorate +0.21 M potassium perchlorate

0.16 M hydrofluoric acid + 0.13M sodium fluoride

0.28 M ammonia + 0.37 Mbarium hydroxide

0.24 M hydrobromic acid + 0.16M sodium bromide

2) Which of the following aqueous solutions are good buffer systems? (can be more than one)

0.20 M barium hydroxide + 0.24M barium chloride

0.12 M hydrofluoric acid + 0.20M potassium fluoride

0.39 M hydrocyanic acid + 0.27M potassium cyanide

0.24 M nitric acid + 0.17 Msodium nitrate

0.28 M ammonium bromide +0.38 M ammonia

3) Which of the following aqueous solutions are good buffer systems? (Can be more than one)

0.27 M ammonium bromide +0.34 M ammonia

0.33 M hydrofluoric acid + 0.25M sodium fluoride

0.16 M acetic acid + 0.19 Mpotassium acetate

0.22 M perchloric acid + 0.20 Msodium perchlorate

0.11 M sodium cyanide + 0.22M hydrocyanic acid

Answer 1

1) The right answer is option 3.

Explanation: A buffer system should contain weak acid+corresponding conjugate base (or) weak base + corresponding conjugate acid.

This criterion is fulfilled only in option 3, which is weak acid (HF) + corresponding conjugate base (F^-)

2) The right answer is options 2, 3, and 5.

Explanation:

Option 2: weak acid (HF) + corresponding conjugate base (F^-)

Option 3: Weak acid (HCN) + corresponding conjugate base (CN^-)

Option 5: Weak base (NH₃) + Corresponding conjugate acid (NH₄⁺)

3) The right answer is options 1, 2, 3, and 5.

Explanation:

Option 1: weak base (NH₃) + corresponding conjugate acid (NH₄⁺)

Option 2: weak acid (HF) + corresponding conjugate base (F^-)

Option 3: Weak acid (CH₃COOH) + corresponding conjugate base (CH₃COO^-)

Option 5: Weak acid (HCN) + Corresponding conjugate base (CN^-)