Why is the reaction flask corked during experiments verifying conservation of mass?
To prevent loss of matter
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction, so the total mass of reactants equals the total mass of products.
To verify it, the system must be closed: the flask is corked so that no gas escapes and no air enters, and the mass measured before and after the reaction stays the same.
Corking does not speed up, cool or ventilate the reaction.
Hence, the answer is To prevent loss of matter.
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Important Questions from Basic Concepts of Chemistry
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