Purple Cabbage

Today at science we were doing something called purple cabbage we had to turn it into a purple milkshake but it would taste very yuck joking we didn't drink it but we did make it into a milk shake it smelled like kiwi fruit but the smell was very strong.


Purple Cabbage Experiment

Last period in science we looked at the pH scale. Today we are going to make a purple cabbage indicator that will test the acidity or alkalinity of white vinegar and washing powder. The indicator is neutral and has a pH of 7.

Answer the following questions before you start the experiment.

What colour do you think the white vinegar will turn the purple cabbage indicator?

Why do you think this?

What colour do you think the washing powder will turn the purple cabbage indicator?
Why do you think this?

Method:

1 Peel off three or four big cabbage leaves and put them in a blender filled half full with water. Blend the mixture on high until you have purple cabbage juice.

2 Pour the purplish cabbage liquid through a strainer to filter out all of the big chunks of cabbage. Save the liquid for the experiments to follow.

3 Set out three beakers, side by side. Fill each glass three-quarters full with cabbage juice.

4 Add a little vinegar to the first beaker of cabbage juice. Stir with stirring rod and watch the colour change.

5 In the second beaker, add a little laundry detergent and stir.

6 Take a photo of your 3 beakers side by side.

Reflection:

Were your answers right or wrong?

What number do you think the white vinegar would be on the pH scale?

What number do you think the washing powder would be on the pH scale?

Complete a blog post with photos.