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In an open flask, limestone and acid showed a decrease in mass. What is the most likely reason?

Answer and explanation

Correct answer: Gas escaped

Limestone is mainly calcium carbonate, and an acid reacting with a carbonate produces a salt, water, and carbon dioxide gas. In an open flask, the carbon dioxide can leave the apparatus. Consequently, the balance records a lower mass for the material remaining in the flask, even though mass has not been destroyed. Therefore, option A is the correct explanation. To demonstrate conservation of mass experimentally, the reaction should be carried out in a closed system that retains the gas, and the complete apparatus should be weighed before and after reaction. Option B contradicts conservation of mass, while option C is false because solids have mass and option D is false because acid is matter. The observed decrease is a measurement-system issue caused by escaped gas.

Related tags

ChemistryConservation Of MassCarbonate ReactionLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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