Name: What Is Atomicity?
Uploaded: 2019-07-19
Duration: 3 min 30 s
Description: Atomicity refers to the total number of atoms coming together from a molecule and is one of the important topics in chemistry. In this video, we will learn a...

Question

Draw the diagram to show the experimental setup for the law of conservation of mass.

Accepted Answer

According to the law of conservation of mass, the matter is neither created nor destroyed during a chemical reaction or the mass of products is equal to the mass of the reactants in a chemical reaction. It can be experimentally illustrated as,

Aim: To find out the change in mass before and after a chemical reaction.

Materials required: Sodium sulphate, barium chloride, distilled water, conical flask, spring balance, small test tube, retort stand, rubber cork, thread, etc.

Procedure: Prepare a solution of sodium sulphate by dissolving sulphate approximately $2$ grams of sodium sulphate in $100 ml$ of distilled water in a $250 ml$ conical flask. Now, prepare a barium chloride solution by dissolving approximately $2$ grams of barium chloride in $100 ml$ water in another conical flask. Take $4 ml$ solution of barium chloride in a small test tube from the above prepared solution. Now, hang the test tube in the conical flask carefully as shown in the figure without mixing with the solution and close the flask with a cork. Weigh the flask with the contents using a spring balance.

Now, mix the contents well and let them react. Weigh the flask again.

Observations and conclusions: It is observed that, the weight of the flask and contents before mixing is equal to the weight of contents after mixing. That is, here, a chemical reaction called double displacement reaction takes place and the mass remains same before and after the chemical reaction. Therefore, mass is neither created nor destroyed in the chemical reaction. Hence, the law of conservation of mass is proved.

Draw the diagram to show the experimental setup for the law of conservation of mass.

Important Questions on Atoms and Molecules

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