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To Make a Phosphate Buffer at PH 6

Question 33

Multiple Choice

To make a phosphate buffer at pH 6.82 starting with one liter of 10 mM phosphoric acid (pKs are 2.15,6.82,and 12.38) ,you could add

A) 5 millimoles of HCl.
B) 20 millimoles of K⁺.
C) 25 millimoles of HCl.
D) 15 millimoles of KOH.
E) You can't make a buffer by adding HCl or KOH.

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