Water, pH and Macromolecules
Weak acids generally have pKa

pKa values greater than 2
that cannot be used to buffer
values less than 1
been seldom found in living systems

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Water, pH and Macromolecules
Buffer solutions

will always have a pH of 7
cause a decrease in pH when acids are added to them.
are rarely found in living systems
tend to maintain a relatively constant pH.

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Water, pH and Macromolecules
Which of the following statements about water is correct?

It is critical for many of the chemical processes found in living systems
Nonpolar substances like oils are not soluble in it
All of these
Polar substances that can form hydrogen bonds will dissolve in it

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