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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