A Phosphate Buffer Solution (25

question 20

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 monohydrogen phosphate and sodium dihydrogen phosphate. The first endpoint occurred at a volume of 10.32 mL; the second occurred after an additional 18.62 mL was added, for a total volume of 28.94 mL. What was the approximate ratio of HPO₄^2 to H₂PO₄^ in the buffer?

• A)1:1
• B)4:5
• C)5:3
• D)5:4
• E)3:5

Describe the stereochemistry of polymers and understand the significance of tacticity.

Explain why certain polymers cannot be formed directly from their corresponding monomers.

Understand the role of initiators in polymerization reactions.

Describe the characteristics and applications of specific polymers such as polyurethane, poly(acrylonitrile), and neoprene.

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