Today some of the children in the discovery room wanted to make an explosion. We decided to try and make one using lemons and tangerines. We placed the orange and tangerine onto a plate and then took the tops off and squished the insides of the fruit to bring out some of the juice. We then squeezed some washing up liquid into the juice and added some food colouring and a teaspoonful of baking soda. After we did this, we watched as the fruits exploded with colourful bubbles! It was so exciting!!
We talked about the science and how the experiment worked. Citrus fruit contains citric acid which has a chemical reaction when it mixes with the baking soda due to form carbon dioxide, which is a gas. Once the citric acid and the baking soda have neutralised each other the reaction stops and no more gas is made. The children had so many things to say about the experiment including:
“ I think the lemon has more citrus acid in it than the tangerine because the lemon has bigger bubbles”

“I want my explosion to be rainbow colours”” Look the blue and red has turned black”
“I need more baking powder I want a big explosion “ “ It feels slimy if you touch it” “The lemon smells nice”

We really enjoyed participating in this fun science activity.