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Law of Conservation of Mass


Take 5% of sodium carbonate solution in a conical flask. Take copper sulphate solution in an ignition tube. Hang the ignition tube in the flask and cork it. Now weigh the conical flask with the ignition tube. Note the reading. After taking reading before the reaction tilt and swirl the flask. What happens? The copper sulphate solution in the ignition tube gets mixed with sodium carbonate solution and a reaction takes place and the products are formed. Now again weigh the conical flask after the completion of reaction. Note the reading again. What do you observe from the reading before and after the reaction?

The weight of conical flak and ignition tube before the reaction is equal to the weight after the reaction. What does it show? The mass of the reactant and products is found to be the same.

Law of conservation of mass states that mass can neither be created nor be destroyed
in a chemical reaction. In a chemical reaction, A + B C + D.
Mass of A + Mass of B = Mass of C + Mass of D


Example : C + O2 CO2

(12.011) + (2 x 15.999) = [12.011 + (2 x 15.999)]

H2 + 1/2O2 H2O(2 x 1.00794) + (1/2(2 x 15.999)) = [(2 x 1.00794) + 15.999]



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