Water, pH and Macromolecules
Buffer solutions

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

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Water, pH and Macromolecules
Salt dissolves well in water as water molecules

share electrons with the ions to make polar covalent bonds
make nonpolar covalent bonds with the positively charged ions only
form hydrogen bonds with the positively and negatively charged ions
surround the ions because of their charge but do not form hydrogen bonds

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Water, pH and Macromolecules
Hydrogen bonds and hydrophilic interactions are types of

weak chemical bonds that link together separate molecules
weak chemical bonds that hold together the atoms within a molecule
strong chemical bonds that link together separate molecules
strong chemical bonds that hold together the atoms within a molecule

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

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Water, pH and Macromolecules
Which of the following character does not apply to water?

The water molecule is asymmetric
The covalent bonds in water are highly polarized
The water molecule readily forms hydrophobic interactions
All three atoms in the water molecule readily form hydrogen bonds

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