Water and pH
 The Water Molecule. All substances are made up of millions of tiny atoms.
These atoms form small groups called molecules. In water,
for example, each molecule is made up of two hydrogen atoms and
one oxygen atom. The formula for a molecule of water is H2O.
"H" means hydrogen, "2" means 2 hydrogen
atoms, and the "O" means oxygen.
Acids and bases in water. When an acid is poured into
water, it gives up H (hydrogen) to the water. When a base is
poured into water, it gives up OH (hydroxide) to the water. Find
out more about atoms, ions, acids, and
bases. A pH graph helps demonstrate
this idea. A pH table lists the pH of
common substances.
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