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Which of the following aqueous solutions are good buffer systems? a. 0.12 M sodium hydroxide + 0.23 M sodium bromide b. 0.29 M nitric acid + 0.22 M sodium nitrate c. 0.28 M ammonia + 0.35 M ammonium bromide d. 0.36 M potassium chloride + 0.25 M potassium perchlorate e. 0.15 M acetic acid + 0.14 sodium acetate