The pH Factor

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.

Lesson Plans

Making Water Molecules

Atomic Gumdrops

On Explaining Science

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