easter indicator eggs

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THE SCIENCE LAB

Make & Do Activity Kit

500 Harris St Ultimo

PO Box K346 Haymarket NSW 1238

Australia

Tel: 02 6217 0111

http://play.powerhousemuseum.com

This work is licensed under the Creative

Commons Attribution-NonCommercial-

ShareAlike 2.5 License.

Indicator eggs

By using red cabbage indicator you can test substances tond out which are acids and which are bases.By soakinghardboiled eggs in this sollution you can use the same method

to paint and decorated them in dierent colours.

Time:2+ hrs

Difculty:Hints: Observe what happens to the colouro your eggs when they are let or a day.

Adults only step: Chop

some red cabbage leaves

into small pieces and place

in a saucepan. Pour water

over the cabbage and boil.

Simmer or 20 minutes.

1.

Allow mixture to cool a little

until it is very warm. Strain

the leaves rom the water

into a large bowl. Pour the

juice back into the pan.

Compost the leaves.

2.

Add the peeled boiled eggs

to the warm cabbage water

and allow it to soak or

20 minutes. They will turn

blue. Allow the eggs to dry

completely.

3.

Mix 1 teaspoon o baking

soda and 1 teaspoon o

water in a dish. Mix a

teasoon o lemon juice

with a teaspoon o water in

another dish.

4.

Painting with lemon will

turn a pink colour and

indicates lemon is an acid.

Painting with baking soda

turns a green/blue colour

indicating it is a base.

5.

Allow to dry. Your eggs

are still edible but i

you experiment with

other substances we

recommend that you do

not eat them.

6.

4 peeled hard boiled

eggs

a saucepan

a large spoon

2 paint brushes or 2

cotton tips

1/4 o a red cabbage

1 litre o water

a knie

a cutting surace

a strainer

baking soda

1 juiced lemon

2 small dishes

1 large bowl

1 clean old teatowel

What you will need:

500 Harris St. Ultimo

PO Box K346 Haymarket NSW 1238Australia Tel: 02 9217 0111


Creative Commons Licence for use of this work

This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Australia Licence (CC BY-NC 3.0 AU)

http://creativecommons.org/licenses/by-nc/3.0/au/


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Australia

Tel: 02 6217 0111





THE SCIENCE LAB


Indicator eggs

Recording your results:

Use these egg shapes to record the colour results

that you get rom each experiment. Label each with

the name o the substance you used. The PH colour

chart on the next page can be used to match your

eggs colour. It will Indicate the amount o acid

or base in your test substance. Record where the

substances ts on the PH scale.

Acid, base or neutral:

Whats going on?

Substances can be either an

acid, base or neutral. In orderto test i something is an acid or a base we can

use an indicator. An indicator will change in colour

when it goes rom acidic to basic conditions and

can tell us the pH o dierent things. Red cabbage

contains a natural pigment molecule called favin

which changes colour when it comes into contact

with acids and bases. Egg whites are slightly basic.

Lemon juice and vinegar are both acid so they will

turn pinks or oranges. Baking soda turns a green/

blue colour indicating a base is present.

What else can I do:

Activity 1: Homemade litmus paper

Try our instructions or making Homemade litmus

paperand nd things to test or acids and bases

around the house such as soaps, lemonade and

cream o tartar. There is a larger list o suggestions

in the Homemade litmus paperinstructions

download. You can also use these substances to

experiment on your egg but it is important to note

they will no longer be edible.

Activity 2 : Colourul artwork

Litmus paper can be used to create coloured paper.

You can make these into cards and wrapping paper.

You will nd instruction in the Homemade litmus

paperactivity.

500 Harris st. UltimoPO Box K346 Haymarket NSW 1238

Australia Tel: 02 9217 0111


Creative Commons Licence for use of this workThis work is licensed under a Creative Commons Attribution-

NonCommercial 3.0 Australia Licence (CC BY-NC 3.0 AU)

http://creativecommons.org/licenses/by-nc/3.0/au/


3/3

Page 3



Australia

Tel: 02 6217 0111





THE SCIENCE LAB


Indicator eggs

easter indicator eggs

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