COBALT CHLORIDE AND WATER EQUATION SERIES

Record any observations that you made during the heating process and when the water was poured back on to the anhydrous copper(II) sulfate. Adapt the experiment to study the changes observed when solid hydrated cobalt(II) chloride is heated. Holding the test tube containing anhydrous copper(II) sulfate in one hand, pour the collected water very slowly on to the white powder. Allow the anhydrous copper(II) sulfate to cool back to room temperature.ĥ. Lift the clamp stand so that the delivery tube does not reach into the water in the test tube.Ĥ. Act quickly to prevent suck-back if the level of water collecting in the test tube reaches the end of the delivery tube. Move the flame along the length of the test tube from time to time (avoiding the clamp), to prevent water condensing on the cooler regions and then running down on to the hot solid, possibly cracking the test tube.ģ. Heat the blue copper(II) sulfate until it has turned white. Make sure that the tube is clamped near the bung as shown.Ģ. Set up the apparatus and place about 5 g of powdered hydrated copper(II) sulfate in the test tube. Hydrated copper sulfate ⇆ anhydrous copper sulfate + waterġ. The white anhydrous copper(II) sulfate is then rehydrated and the blue colour returns. Condensing the vapour produced in a second test tube collects the water. In this experiment, the water of crystallisation is removed from hydrated copper(II) sulfate by heating.

COBALT CHLORIDE AND WATER EQUATION SERIES

A series of free IGCSE Chemistry Activities and Experiments (Cambridge IGCSE Chemistry).

Cobalt chloride and water equation