4. Some contact lens solutions use boric acid buffers to resist pH change. Over what pH range does boric acid have good buffering capacity? Show your work.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Please answer question 4
4. Some contact lens solutions use boric acid buffers to resist pH change. Over what pH range does boric
acid have good buffering capacity? Show your work.
5. You need to make a pH 6.5 buffer. Which of the following reagents would you choose to make the
buffer? Briefly explain.
NazCOs
NaHCOs
HCI
NaOH
6. Calculate the masses of NaH2PO4 H20 and NazHPO, 7H20 needed to make 100.0 mL of a 0.100 M
phosphate buffer with pH = 7.40
Mass of NaH2PO4 H20 =,
Mass of NazHPO4 7H20 =.
Transcribed Image Text:4. Some contact lens solutions use boric acid buffers to resist pH change. Over what pH range does boric acid have good buffering capacity? Show your work. 5. You need to make a pH 6.5 buffer. Which of the following reagents would you choose to make the buffer? Briefly explain. NazCOs NaHCOs HCI NaOH 6. Calculate the masses of NaH2PO4 H20 and NazHPO, 7H20 needed to make 100.0 mL of a 0.100 M phosphate buffer with pH = 7.40 Mass of NaH2PO4 H20 =, Mass of NazHPO4 7H20 =.
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