1. Prepare 5% of barium chloride (5g of BaCL in 100 ml of water) and sodium sulphatesolutions separately.
2. Take some solution of sodium sulphate in a conical flask and some solution of barium chloride in a test tube.
3. Hang the test tube in the conical flask.
4. Weigh the flask with its contents. Now mix the two solutions by tilting and swirling the flask. Weigh the flask after the chemical reaction is occurred.
5. Record your observation. It can be seen that the weight of the flask and the contents remains the same before and after the chemical change.
6. Hence, it is proved that during a chemical change, the total mass of matter remains the same.
