Science Activity: Magic Colour

We had a late afternoon storm and were stuck inside, so we decided to do some quick fun science experiments before dinner.  The kitchen is definitely a great place to find all the goodies you need to play with.

Here is one of the experiments we did:

Magic Colours

Aim:  To show a magic colour-changing trick to Harvey

Apparatus:

  1. Baking powder
  2. Vinegar
  3. Muffin tray
  4. Food colouring

Method:

  1. Add a few drops of food colouring in the muffin tray
  2. Add baking powder and fully cover the food colour
  3. Pour vinegar on top the baking power
  4. Watch what happens

Results/Observation:

Analysis:

This is an Acid-Base reaction

Baking Soda (Sodium Bicarbonate) = Basic compound.

Vinegar  (Acetic Acid) = Acid compound

Ref: http://highschoolenergy.acs.org/content/hsef/en/how-can-energy-change/exothermic-endothermic-chemical-change.html

The bubbles are results of carbon dioxide gas escaping.  The water dissolve the food colour and turn the white baking soda powder to the colour that were originally added.

Conclusion:  

Harvey was surprised how the white powder changed into different colour.  However, the highlight for Harvey seemed to be the bubbles as a result of CO2 gas

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