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Of the following pairs of acids and conjugate bases, which should be used to prepare a buffer solution whose pH is approximately 5.0?
Boric acid (Ka = 5 x 10-5) and sodium borate
Acetic acid (Ka = 1.8 x 10-5) and sodium acetate
Sodium hydrogen sulfate (Ka = 1.2 x 10-2) and sodium sulfate
Phosphoric acid (Ka1 = 7.1 x 10-3) and sodium dihydrogen phosphate
Carbonic acid (Ka1 = 3.5 x 10-7) and sodium bicarbonate
Sagot :
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