Red cabbage juice indicator. Acids neutralize bases and change indicators to distinctive colors. Bases are compounds that contain atoms of a metal and one or more hydroxyl groups.
Bases react with litmus to produce distinctive colors.
The day before the activity, the children will take home 5-6 pieces of litmus paper. They will place each piece of litmus paper in a different household chemical. They will bring these pieces of paper back to class the next day. I want to put your results here in a chart on the chalkboard. The teacher will list all of the chemicals used on the board.