Testing out acids and alkali Objective: To make our own indicator To test the substance whether they are an acid or an alkali. Apparatus: Red cabbage Pipette Filter paper Pestle Mortar Bicarbonate of soda, orange juice, lemon juice, cola, toothpaste, tap water, vinegar and dish washer. Methods: 1. Chop up some red cabbage and use pestle and mortar to crush them. Add some small amount of water. 2. Drain the red cabbage juice. More water is added to dilute the solution. 3. Soak some filter paper onto the juice and leave to dry. 4. Once dry, paint some acids and alkali on top of it and observe the color changes. 5. Record the observation in the table below. Results and observation: Substance Colour (before) Colour (after) Acid or alkali Bicarbonate of soda Cola Lemon juice Orange juice Toothpaste Dish washer Tap water Vinegar Conclusion: Indicator turns ________ when tested with acids and it turns _________ when tested with an alkali. The red cabbage have to be crushed to get its juice.