Water, pH and Macromolecules
The pH of a solution is determined by

dielectric constant of the medium
concentration of salt
environmental effect
relative concentration of acids and bases

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

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