Which of the following aqueous solutions are good buffer systems? (Select all that apply.)
1.
0.13 M hypochlorous acid + 0.19 M potassium hypochlorite
0.30 M hydrobromic acid + 0.19 M sodium bromide
0.28 M ammonia + 0.32 M ammonium bromide
0.16 M potassium hydroxide + 0.22 M potassium chloride
0.35 M sodium iodide + 0.24 M sodium nitrate
2.
0.21 M hypochlorous acid + 0.14 M sodium hypochlorite
0.29 M perchloric acid + 0.20 M potassium perchlorate
0.28 M ammonium nitrate + 0.33 M ammonia
0.18 M potassium hydroxide + 0.24 M potassium bromide
0.40 M hydrocyanic acid + 0.30 M potassium cyanide
3.
0.21 M hydrofluoric acid + 0.17 M sodium fluoride
0.21 M hydrochloric acid + 0.18 M sodium chloride
0.28 M ammonia + 0.39 M barium hydroxide
0.12 M potassium hydroxide + 0.29 M potassium bromide
0.35 M sodium iodide + 0.23 M barium iodide