Miss Redhead’s science club week 2

We have had great fun in science club this week.

Last week we identified that some chemicals are acids and alkalis.

This week we tested to find out which chemicals were acids and which were alkalis.

We did not have any litmus indicator, but we created our own.

Can you explain how we made our indicator and why it worked?

Which chemicals were acid and which were alkalis?

Where on the PH scale would you put lemon juice? Where on the scale would you put baking soda?

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10 thoughts on “Miss Redhead’s science club week 2

  1. To make the indicator we grated a red cabbage and squeezed the juice out of it. Then we put it to test. Indicators are the chemical compounds,which when mixed with any solution tells you whether it is an acid or alkaline.

    Here in case of red cabbage the pigment Anthocyanin acts as an indicator.
    Vinegar and lemon juice were acids and soda was an alkaline.

    Lemon juice is a weak acid and gave a pinkish red colour and comes out with a PH of 3. Whereas baking soda when mixed with cabbage juice gave a purplish blue colour proving it to be a weak alkaline.The PH of baking soda is around 8.

  2. We used red cabbage to make the indicator. We made it work by following the instructions correctly. Miss Redhead gave us instructions to follow which made us do it right. We made an indicator by doing the steps at the right time as well as just following them. If we didn’t have the instructions, we could never have done. We would try again and again.

    Salt- Alkaline (number roughly on the PH scale-11)
    Vinegar- Acid (number roughly on the PH scale-3)
    Vitamins- Acid (number roughly on the PH scale-3)
    Baking Powder- Acid (number roughly on the PH scale-5)
    On the PH scale, I would put lemon juice on the number 13 because it is an alkaline. I would put baking powder on the number 5 because it is an acid.

    I enjoyed learning about the PH scale.

    • the baking powder and the vinegar were both acid and they were both around in the 0 area so they very strong acids.However,the water was green and that means that it was nutrial around the middle of the scale and there was no ingridients that we tested were blue (alkaline).

  3. We made our Litmus Indicator by using a red cabbage.The reason they call it a red cabbage is because when you cook it it turns red.We cut and grated the cabbage then we put some of it in a bowl and mixed it with water then using a wooden spoon we crushed it down then using a sieve we got out all of the water which was mixed with it.That was then our Litmus Indicator

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