Question

Two students Sam and Ro

science lab.

R

erforming experiments in the

Sam mixed 10.6 g of sodium carbonate in a conical flask with 12 g of hydrochloric acid in an ignition tube. He took care that the solutions did not mix with each other. He then put a cork on the conical flask and weighed the flask with the ignition tube and its contents.

After weighing the flask for the first time Sam tilted it and allowed the solutions to mix and react. He then weighed the conical flask again. Sam found that the mass of the flask with its contents both before and after the experiment was the same.

Rohit mixed 10.6 g of sodium carbonate in a conical flask with 12 g of Hydrochloric acid in ignition tube. He took care so that the solutions did not mix with each other. He weighed the flask with the ignition tube and its contents. He then tilted the conical flask to allow the solutions to mix and react. After the experiment, Rohit again weighed the conical flask. Rohit found that the mass of the flask with its contents both before and after the experiment was the not the same

(i) State the law which was being tested in the experiment. (ii) Why did Rohit get a difference in the mass?​

Answer 1

Answer:

law of conservation of mass

Explanation:

Answer 2

Law of Conservation of mass

Explanation:

1. The law followed in the experiment is conservation of mass, according to which the mass can neither be created nor be destroyed but can be transformed from one form to another during a chemical reaction.                                      i.e. mass of reactants = mass of products.
2. Rohit gets the difference in mass because he didn't use the cork on the conical flask and allowed the solutions to mix; thus, the gas formed during the reaction evolve and leave the flask that will create the difference in mass of the sample before and after.