Water, pH and Macromolecules
Buffer solutions

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

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Water, pH and Macromolecules
The main difference between an acid and a base is that

acids donate hydrogen ions in water while bases accept hydrogen ions
acids are polar molecules and bases are not
bases donate hydrogen ions in water while acids accept hydrogen ions
bases are polar molecules and acids are not

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