Part A: Which of the following aqueous solutions are good buffer systems? -- 0.1

ID: 1004129 • Letter: P

Question

Part A:

Which of the following aqueous solutions are good buffer systems?

-- 0.10 M potassium hydroxide + 0.21 M potassium chloride

-- 0.34 M ammonia + 0.36 M sodium hydroxide

-- 0.16 M hydrofluoric acid + 0.21 M sodium fluoride

-- 0.22 M perchloric acid + 0.21 M potassium perchlorate

-- 0.39 M sodium chloride + 0.25 M potassium chloride

Part B:

Which of the following aqueous solutions are good buffer systems?

-- 0.17 M potassium hydroxide + 0.20 M potassium chloride.

-- 0.26 M ammonia + 0.38 M ammonium bromide.

-- 0.22 M hydrobromic acid + 0.22 M sodium bromide.

-- 0.22 M acetic acid + 0.13 M hydroiodic acid.

-- 0.31 M calcium nitrate + 0.30 M potassium nitrate.

part A) answer : 0.16 M hydrofluoric acid + 0.21 M sodium fluoride

explanation: buffer is the mixture weak acid/base and its salt of strong base/acid

remaining all are form strong acid and strong base so they cannot act as buffer

part B) answer : 0.26 M ammonia + 0.38 M ammonium bromide.

it is weak base NH3 and salt of strong acid . so it is good buffer