Question

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

Answer 1

Answer:

try this

Explanation:

Preparation of 250ml M/10 (0.1 M) sodium carbonate solution

Using an electronic balance. we’ll first weigh about 2.65g of sodium carbonate crystals in a weighing bottle and transfer these into a 250ml beaker.

Wash the weighing bottle 2 or 3 times using distilled water and transfer all the washings into the beaker. Dissolve the sodium carbonate crystals in the beaker by gentle stirring with a clean glass rod.

When the sodium carbonate crystals in the beaker dissolve completely, transfer the entire solution from the beaker into a 250ml standard flask through a funnel, using a glass rod.

Wash the beaker 2 to 3 times with distilled water and transfer all the washings into the standard flask.

Finally wash the funnel thoroughly with distilled water. This transfers the solution completely into the standard flask.

Using a wash bottle, add enough distilled water to the standard flask so that the level is just below the calibration mark on it. Add the last few drops of distilled water with a pipette until the lower level of the meniscus just touches the mark on the standard flask.

Stopper the measuring flask and shake gently to make the solution uniform throughout.

Answer 2

Answer:

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