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Which of the following aqueous solutions are good buffer systems? a) 0.13 M potassium hydroxide + 0.24 M potassium bromide b) 0.22 M hypochlorous acid + 0.19 M sodium hypochlorite c) 0.23 M hydrochloric acid + 0.23 M potassium chloride d) 0.32 M hydrofluoric acid + 0.27 M sodium fluoride e) 0.27 M ammonium bromide + 0.40 M ammonia