Grape indicator - made by Suyeon

Suyeon accepted one of the challenges for the Acids and Alkalis unit and made her own indicator at home. She took photos of each step and presented her work today in the Science lesson. Well done Suyeon!

Step 1 - remove the grape peel from black grapes (the darker the colour, the more dye we can obtain)

Step 2 - cut the peels in small bits, so that we can extract more dye out of them

Step 3 - add hot water and mix well

Step 4 - prepare a filter 

Step 5 - filter the mixture, in order to remove the solid peels from the indicator solution

Step 6 - transfer the indicator extract to a test tube

Step 7 - test the indicator with various substances: vinegar, lemon, green tea

Y7 Acids and alkalis challenges

1.  Memrise course for the Acids and Alkalis unit - the more points you get on the course, the more xp you receive :)
2. Make you own indicator: you can use various colored extracts to test the pH (red cabbage juice, black currant juice etc). Can you identify and test out your own indicator?
3. Prepare a pH scale that shows the pH of everyday substances we use like milk, coffee, eggs, bleach etc. Be as creative as possible in displaying the pH and the substance :)
4. Prepare your own revision materials: newsletter articles, posters, presentations etc.