In P4, we have been investigating solids that dissolve in water. We first made predictions about which solids we thought would dissolve in water and then investigated this to find out if we were correct. We carried out a controlled experiment – taking care to keep the amount and temperature of water, amount of solid and time stirring the same. We found out that some solids were soluble (like salt and sugar) and some were insoluble (like sand). And we had great fun too!