Purple Cabbage Experiment

This Friday in science we made an experiment about cabbage. We use cabbage blended with water as an indicator. I really like science because you can do some fun stuff like making a volcano explode and more like just we did today. 
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 white vinegar will turn the purple cabbage indicator? I think it might turn to colour red.
Why do you think it will turn to red? Because the vinegar is sour so maybe it will wash away the color and turn it to red.
What colour do you think white vinegar will turn the purple cabbage indicator? Still purple
Why do you think that? Because the washing powder is alkaline.
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? I only got 1 question right because the cabbage turns out colour red, green and I think red.
What number do you think the white vinegar would be on the pH scale? 3.0
What number do you think the washing powder would be on the pH scale? 8 / 9













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