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Which of the following aqueous solutions are good buffer systems? a. 0.15 M potassium hydroxide + 0.22 M potassium chloride b. 0.26 M hydrochloric acid + 0.16 M potassium chloride c. 0.35 M calcium chloride + 0.29 M sodium chloride d. 0.28 M ammonia + 0.33 M ammonium nitrate e. 0.16 M hypochlorous acid + 0.20 M perchloric acid