Chemistry students completed a quick lab activity in order to apply their stoichiometry skills to determine the amount of waters attached to the copper sulphate crystals from the chemical cabinet. They performed the heating (using the espresso stove and stand!) and took measurements of mass. Then, the worked together on whiteboards to determine ‘x’, the number of water molecules in the hydrate complex. 

They successfully determined that there was five for each copper sulphate. After completing the lab, we had another quick demo about heat of reactions. Since removing the water was endothermic, adding the water back must be exothermic. We added water to the pale white powder to see what would happen.

copper sulphate hydrate

copper sulphate hydrate