An acid is a substance that has the following properties:
Acids range from being very corrosive (concentrated sulphuric acid) to safe for humans (citric acid, like lemon). Corrosive acids need to be handled with care. Use gloves and goggles.
The pH scale
When an acid combines with a base, salt and water are released.
Some common acids
An base is a substance that has the following properties:
The pH scale slider
Some bases are alkalis. They get their name from the alkali elements in the periodic table.