We were excited by the chemical reaction we created when mixing citric acid, bicarbonate of soda and water together.  It fizzed and frothed and we explored how this change was irreversible.

We then worked in our groups to use icing sugar, citric acid and bicarbonate of soda to try and create the perfect tasting sherbet.  It took quite a bit of development (and taste testing), but some groups managed perfect tasting sherbet in the end!