We had a great time at the Otago Museum. We did lots of fun experiments. We made a frothy green toothpaste and we popped film canisters with water and alka seltza. We put alka seltza tablets into oil and coloured water to make lava lamps. We changed purple cabbage juice into different colours by adding acids like lemon juice or vinegar or by adding an alkaline like baking soda. We put lots of Mentos sweets into a bottle of Coca Cola and it suddenly frothed up! We had a lot of laughs.
