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 HPO42- 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
Correct Answer:
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