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

Acids, alkalis and indicators

We have been playing with acids and alkalis for the last two weeks in the Science lessons. We have compared different indicators and most importantly, we checked what's happening when acids neutralise alkalis.

The results are colourful master pieces :)
Enjoy!