Water, pH and Macromolecules
Weak acids generally have pKa

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

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Water, pH and Macromolecules
Buffer solutions

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

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

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

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