Which of the following aqueous solutions are good buffer systems? . 0.34 M sodiu
ID: 304053 • Letter: W
Question
Which of the following aqueous solutions are good buffer systems?
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0.34 M sodium iodide + 0.23 M barium iodide
0.12 M acetic acid + 0.14 M sodium acetate
0.25 M ammonia + 0.31 M sodium hydroxide
0.26 M hydrochloric acid + 0.19 M potassium chloride
0.20 M barium hydroxide + 0.28 M barium bromide
Which of the following aqueous solutions are good buffer systems?
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0.12 M sodium nitrite + 0.27 M nitrous acid
0.20 M acetic acid + 0.21 M potassium acetate
0.28 M ammonium bromide + 0.36 M ammonia
0.38 M hydrocyanic acid + 0.23 M sodium cyanide
0.24 M hydrochloric acid + 0.23 M sodium chloride
Explanation / Answer
Buffer is a mixture of a weak acid and its highly ionisable salt or a weak base and its highly ionisable salt. In the first question acetic acid is weak acid and its highly ionisable salt is sodium acetate. So this mixture can act as buffer. So 2nd option is right answer.
In the second question 2nd and 3rd answers are correct. ammonium hydroxide is a weak base and its highly ionisable salt is ammonium bromide. The same is true for acetic acid and potassium acetate mixture.
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