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

form hydrogen bonds with the positively and negatively charged ions
share electrons with the ions to make polar covalent bonds
surround the ions because of their charge but do not form hydrogen bonds
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.
will always have a pH of 7
are rarely found in living systems
tend to maintain a relatively constant pH.

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