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Give the letters of the solutions below that represent buffers. (a) a solution of sodium dihydrogen...

Give the letters of the solutions below that represent buffers. (a) a solution of sodium dihydrogen phosphate in water; (b) a solution of sodium hydrogen sulfate and sodium sulfate; (c) a solution of acetic acid and sodium acetate; (d) a solution of phosphoric acid and potassium dihydrogen phosphate.

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