Which of the following aqueous solutions are good buffer systems? . 0.31 M ammon

ID: 499867 • Letter: W

Question

Which of the following aqueous solutions are good buffer systems?

. 0.31 M ammonium bromide + 0.39 M ammonia

0.31 M nitrous acid + 0.25 M potassium nitrite

0.21 M perchloric acid + 0.21 M potassium perchlorate

0.16 M potassium cyanide + 0.21 M hydrocyanic acid

0.14 M hypochlorous acid + 0.21 M sodium hypochlorite

0.13 M nitrous acid + 0.12 M potassium nitrite

0.15 M potassium hydroxide + 0.22 M potassium bromide

0.23 M hydrobromic acid + 0.20 M potassium bromide

0.34 M calcium iodide + 0.29 M potassium iodide

0.33 M ammonia + 0.30 M sodium hydroxide

0.20 M nitrous acid + 0.18 M potassium nitrite

0.30 M ammonia + 0.34 M ammonium bromide

0.29 M hydrobromic acid + 0.22 M sodium bromide

0.17 M calcium hydroxide + 0.28 M calcium bromide

0.34 M potassium iodide + 0.27 M potassium bromide

buffer system --> must have a conjguate acid/base with its respective weak base / acid

so:

0.31 M ammonium bromide + 0.39 M ammonia --> NH4+ and NH3 are present, good buffer

0.31 M nitrous acid + 0.25 M potassium nitrite --> good buffer, HNO2 and NO2- present

0.21 M perchloric acid + 0.21 M potassium perchlorate --> strong acid, will not form bnuffer

0.16 M potassium cyanide + 0.21 M hydrocyanic acid --> good buffer, CN- and HCN present

0.14 M hypochlorous acid + 0.21 M sodium hypochlorite --> good buffer, HClO and ClO-

0.13 M nitrous acid + 0.12 M potassium nitrite --> HNO2 + NO2- , good buffer

0.15 M potassium hydroxide + 0.22 M potassium bromide --> OH- and Br, will not form buffer

0.23 M hydrobromic acid + 0.20 M potassium bromide--> HBrO , strong acid, will not form buffer

0.34 M calcium iodide + 0.29 M potassium iodide --> two salts will not form buffer

0.33 M ammonia + 0.30 M sodium hydroxide --> NH3 + NaOH --> no conjugate present, no buffer

0.20 M nitrous acid + 0.18 M potassium nitrite --> HNO2 and NO2- present, good buffer

0.30 M ammonia + 0.34 M ammonium bromide --> NH3 and NH4+´, good buffer

0.29 M hydrobromic acid + 0.22 M sodium bromide --> storng acid, will not form buffer

0.17 M calcium hydroxide + 0.28 M calcium bromide --> strong base, will not form buffer

0.34 M potassium iodide + 0.27 M potassium bromide --> two salts wont form buffer

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