PK_a values of Phosphoric Acid Are 2

question 9

Multiple Choice

pK_a values 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 HPO₄^2-.
• B) HPO₄^2- and PO₄^3-.
• C) H₃PO₄ and HCl.
• D) None of the above

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