Question

With the help of an activity verify that there is no change in mass when a chemical change takes place.

Answer 1

Dear student

We can take two chemicals like, Copper sulphate and sodium carbonate and prepare a 5% solution of each in water.
Copper sulphate solution is taken in an ignition tube and sodium carbonate in a conical flask. The ignition tube is carefully hanged in the conical flask, so that the solutions do not get mixed, and the mouth of the flask is covered with a cork. The flask is weighed and weight is noted down. Then the flask is tilted so that the components of the ignition tube and the conical flask get mixed. After which the weight is again noted. It is found that even after the chemical reaction takes place, the weight remains same.
This proves that there is no change in mass when a chemical change takes place.


Thus no change in mass takes place.
Regards