Oceanography Books

Facebook Twitter Email

Science Lab Experiment: Properties of Hydrates


Demonstration: Hydrates

Object: To determine the special characteristics of hydrates.

Materials: test tube, stand and clamp, alcohol lamp, cobalt chloride, water

Diagram:
hydrate properties


Method: A few grains of pink cobalt chloride were added to the test tube and heated as shown in the diagram.

Observations: As the pink cobalt chloride was heated, a fine mist was noticed on the inside of the test tube. The cobalt chloride turned blue. When a few drops of water were added to the blue cobalt chloride, it turned back to a pink colour.

Conclusions: It was concluded that cobalt chloride contained water which was driven off by heating. This vapour condensed on the cool inside glass of the test tube. When a few drops of water were added to the cobalt chloride, it turned back to the pink colour, indicating that the water had been replaced. Blue cobalt chloride can be used as an indicator of humidity.

Amazon USA
Amazon Canada