Question

In order to verify the law of conservation of mass, a student mixed 6.3 g of sodiumcarbonate and 15 g of ethanoic acid in a conical flask. After experiment, he
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weighed the flask again. The weight of the residue in the flask was only 18g. He
approached the teacher who guided him to carry the experiment in a closed flask
with a cork. There was no difference in weight of the flask before and after the
experiment.
Answer the following questions
What was the mistake committed by the student?
i. Why did not the two weights match earlier?
iii. How did the teacher help him?
iv. What lesson was learnt by the students?
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Answer 1

Answer:

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Explanation:

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