Explain with the help of a labelled diagram an activity for the verification of law of conservation of mass.

Asked by Topperlearning User | 29th Mar, 2016, 05:11: PM

Expert Answer:

Principle- Law of conservation of mass states that mass can neither created nor destroyed in a chemical reaction.

Total Mass of the Reactant = Total Mass of the Product

Diagram-

 

Technique- Take a solution of calcium chloride in a flask labeled A, and a solution of sodium sulphate in a test tube labeled B.

Tie a thread to the test tube and carefully lower it in the flask. Cork the flask to make it airtight.

Weigh the flask on a balance. It weighs 300.23 grams.

Tilt and swirl the flask and allow the contents of the test tube to come in contact with the contents of the flask.

Observation- Calcium chloride reacts with sodium sulphate to form a white precipitate of calcium sulphate and a solution of sodium chloride.

Weigh the flask again. There will be no change in the weight of the flask. It again weighs 300.23 grams.

Conclusion- Scientists noticed that if chemical reactions were carried out in a closed container, there is no change in the mass.

The total mass of the reactants is equal to the total mass of the products.

Answered by  | 29th Mar, 2016, 07:11: PM