Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

only in combination with polyprotic bases
if their concentration is kept low
at pH values around any of their pKa's
at pH values around neutrality

ANSWER DOWNLOAD EXAMIANS APP

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
All of these
Polar substances that can form hydrogen bonds will dissolve in it
Nonpolar substances like oils are not soluble in it

ANSWER DOWNLOAD EXAMIANS APP

Water, pH and Macromolecules
Buffer solutions

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

ANSWER DOWNLOAD EXAMIANS APP