Today we did an experiment that had to do something with the pH scale, what colour will the cabbage turn. I was grouped with Megan and Rieya. I think that our group worked really well especially with participation. First, we broke the cabbages into pieces before putting it in the blender because we saw what the other groups did, they didn't break it into pieces, that's why there were big clumps, after that, we added water to it because we want it to be liquidy and we want it to be easier to blend. We were really surprised, satisfied and amazed by the colour turned out.
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? I think it might turn the colour to a lighter colour like maybe white, green, pink, red.
Why do you think this? because of the vinegar’s strength and because it’s acidic
What colour do you think the washing powder will turn the purple cabbage indicator? I think the colour will still be purple
Why do you think this? 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? For the white vinegar one, I was right, it was red-ish pink but I got it wrong with the washing powder
What number do you think the white vinegar would be on the pH scale? Maybe 3 or 4
What number do you think the washing powder would be on the pH scale? Maybe 8.5? Or 9.5
This was the colour before
...And this is the colour now
The white vinegar turned the colour into red-ish pink and the washing powder turned the colour into green-ish blue.
Wow! SKyler this is a nice post, you have explained very well on what you did.I especially liked the pictures you put on, next time you should try fix the words and make a more of an interesting title. Anyways you did an amazing job keep up the great work.
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