Kitchen Chemistry - Lemon Fizz Experiment

Today we carried out another Kitchen Chemistry Experiment. We needed baking soda, lemon juice, liquid dishwashing soap, food colouring, a spoon and a narrow glass.

We cut the fresh lemon into quarters so that we could squeeze them for their juice

Then we tipped a heaped teaspoon of baking soda into the tall glass


Next, we added a squirt of dishwashing liquid to glass and stirred the mixture.

Then we added a few drops of food colouring to the mixture

Jackson gave the mixture a bit of a stir...

and then we squeezed in the fresh lemon juice.

The baking soda reacted with the citric acid (lemon juice) and formed carbon dioxide gas. The gas bubbles were trapped by the dishwashing soap which formed fizzy bubbles. The food colouring made the bubbles purple instead of white.

Even though we only squirted in a little bit of lemon juice the bubbles filled the entire glass and it even overflowed.

Check out the video!