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Which of the following aqueous solutions are good buffer systems? a. 0.15 M potassium hydroxide + 0.25 M potassium chloride b. 0.28 M ammonium nitrate + 0.37 M ammonia c. 0.31 M hydrocyanic acid + 0.21 M potassium cyanide d. 0.11 M acetic acid + 0.21 M sodium acetate e. 0.28 M hydrochloric acid + 0.22 M potassium iodide