Question

Will rate answer, thanks! 1) Which of the following aqueous solutions are good buffer systems?( can...

Will rate answer, thanks!

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

Homework Answers

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-)

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