Acids taste sour and they will react with some metals to give off hydrogen gas.
Bases taste bitter and feel slippery.
Many substances around your house are acids and bases. Let s make an indicator to show you which are which. Tear the cabbage leaves into small pieces and put them in the pan. Cover the leaves with water and cook slowly until the cabbage leaves have lost most of their color. Let the water cool completely and then pick out the cabbage leaves.