Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK
ID: 1004155 • Letter: W
Question
Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]
0.31 M ammonium bromide + 0.32 M ammonia
0.21 M hypochlorous acid + 0.12 M sodium hypochlorite
0.39 M hydrocyanic acid + 0.24 M sodium cyanide
0.13 M calcium hydroxide + 0.28 M calcium chloride
0.23 M hydrobromic acid + 0.19 M potassium bromide
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Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]
0.19 M barium hydroxide + 0.29 M barium bromide
0.28 M hydrobromic acid + 0.21 M potassium bromide
0.39 M potassium perchlorate + 0.24 M barium perchlorate
0.18 M nitrous acid + 0.13 M sodium nitrite
0.30 M ammonia + 0.39 M sodium hydroxide
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Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]
0.36 M calcium perchlorate + 0.20 M potassium perchlorate.
0.31 M ammonia + 0.36 M ammonium nitrate.
0.21 M nitric acid + 0.16 M sodium nitrate.
0.16 M barium hydroxide + 0.29 M barium chloride.
0.11 M hydrofluoric acid + 0.17 M perchloric acid.
Explanation / Answer
A good buffer system must have (1) a weak acid and its conjugate base, or (2) a weak base and its conjugate acid.
Answers:
0.31 M ammonium bromide + 0.32 M ammonia (weak base and its conjugate)
0.21 M hypochlorous acid + 0.12 M sodium hypochlorite (weak acid and its conjugate)
0.39 M hydrocyanic acid + 0.24 M sodium cyanide. (weak acid and its conjugate)
Rest two are strong bases or strong acids and their conjugates.
Answers:
0.18 M nitrous acid + 0.13 M sodium nitrite (weak acid and its conjugate)
0.30 M ammonia + 0.39 M sodium hydroxide (weak base and its conjugate)
Rest are strong bases ,strong acids and their respective conjugates and other is combination of 2 salts.
Answers:
0.31 M ammonia + 0.36 M ammonium nitrate. (weak base and its conjugate)
Rest are strong acids,strong bases with their respective conjugates and there are combinations of weak and strong acid( 0.11 M hydrofluoric acid + 0.17 M perchloric acid) . which do not form good buffer.
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