Question

Two students Sam and Rohit were performing experiments in the
science lab.
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 106 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 extent th
not the same
State the law which was being tested in the experiment
(ii) Why did Rohit get a difference in the mass?​

Answer 1

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