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PK_avalues of Phosphoric Acid Are 2

Question 9

Multiple Choice

pK_avalues of phosphoric acid are 2.2, 7.2 and 12.7. A phosphate buffer of pH = 7.4 can be prepared using

A) H₂PO₄^-and HPO₄²^-.
B) HPO₄²^-and PO₄³^-.
C) H₃PO₄and HCl.
D) None of the above

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