Making Indicators || Neutalisation

In Science, we have done experiments and we have been learning about base and acid.

Making Indicators

Aim: To make acid-base indicators using everyday substances.

Equipment:

Beetroot, Turmeric, Cranberry juice, Beaker, Water, Tripod, Bunsen Burner, Gauze mat, HCl and NaOH.

Method;

For Beetroot:

1. Chop the beetroot into small pieces until you have enough to fill half of the beaker.

2. Place the beetroot in a beaker and add water to cover the beetroot.

3. Boil over a Bunsen Burner for at least ten minutes for the colours to leach out of the beetroot.

For the Cranberry juice: Pour into a beaker and leave to one side.

For the Turmeric: Mix 1 teaspoon turmeric in 100 mL cup of alcohol. Place in a small beaker and leave to one side.

Task Two:

1. You know have five test tube, each containing a different indicator.

2. Using a pipette, place 5 mL of the beetroot indicator into two test tubes.

3. Add 5 mL of HCl (acid) to one test tube and 5 mL of NaOH (alkali) to the other test tube.

4. Record the colour change on the table below.

5. Clean the test tubes and repeated for the cranberry and turmeric indicators.

Neutralisation

Aim:

To observe a neutralisation

Equipment:

Test Tube

Test Tube rack

Universal Indicator

Sodium Carbonate

Hydrochloric Acid

Method:

1. Add approximately 1-2 mL Sodium Carbonate and place the test tube into the test tube rack. 

Add 3-5 drops of Universal indicator solution.

2. Using a dropper bottle, add HCI(hydrochloric acid) drop by drop. Be careful because adding even a small amount of extra acid can mean you'll miss the neutralisation point.