Acids taste sour and can burn your skin.

Bases taste bitter and feel slippery.

The pH scale measures how acidic or basic a substance is (0-14).

Acids have a pH less than 7; bases have a pH greater than 7.

Neutral substances have a pH of exactly 7.

Vinegar and lemon juice are common acids.

Soap and baking soda are common bases.

Acids and bases neutralize each other to form water and salt.

Indicators like litmus paper show if a substance is acid or base.

Strong acids and bases are dangerous and must be handled carefully.