Question

State the law of conservation of mass. State the main points of Landolt's experiment for experimental evidence of the law.

Answer 1

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Law of conservation of mass states that in any chemical reaction, the initial weight of reactants is equal to the final weight of the products. In other words, Mass can neither be created nor destroyed during a chemical reaction but it only changes from one form into another.

Main points of Landolt's Experiment were:-

(1) A specially designed H-shaped tube is taken with its one limb having Sodium chloride solution and the other have $AgN{O}_3$. This, in the first place was weighed after sealing.

(2) The reaction was made to take place and then the tube was weighed.

(3) The mass of the tube in both the case was found to be the same. Thus redefining the Law of Conservation of Mass.