The fizzing in sherbet is caused by a reaction between an acid and an alkali. When you eat sherbet the citric acid reacts with the bicarbonate of soda and bubbles of carbon dioxide are produced that fizz on your tongue. We have seen other activities that work in a similar way to this. To learn more about acids and alkali's look at the Natural Indicators activity or why not try making bath bombs or a volcano
To make the sherbet we are going to measure out 4 teaspoons of icing sugar, 1 teaspoon of bicarbonate of soda and 2 teaspoons of citric acid into our bowl.
We are then going to mix them all together.
You can now test your sherbet. If it is not sweet enough then you can add a little bit more icing sugar. If it is not fizzy enough then add a little bit more bicarbonate of soda.
The video tutorial for this activity is available on the Surrey Libraries Facebook Page
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