A Phosphate Buffer Solution (25

question 153

Multiple Choice

A phosphate buffer solution (25.00 mL sample) used for a growth medium was titrated with 0.1000 M hydrochloric acid.The components of the buffer were sodium monohydrogenphosphate and sodium dihydrogenphosphate.The first endpoint occurred at a volume of 10.32 mL; the second occurred after an additional 18.62 mL was added (total volume = 28.94 mL) .What was the approximate ratio of HPO₄^2- to H₂PO₄^- in the buffer?

• A)1.000:1.000
• B)0.3566:1.000
• C)2.804:1.000
• D)1.000:1.804
• E)0.6434:1.000

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