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

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

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Water, pH and Macromolecules
Buffer solutions

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

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