Chemistry
(a) State the law of conservation of mass.
(b) What do you observe when barium chloride solution is mixed with sodium sulphate solution?
Matter
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Answer
(a) The law of conservation of mass states that matter can neither be created nor be destroyed in a chemical reaction. Only it can be changed from one form to another during the reaction process.
(b) When barium chloride solution is mixed with sodium sulphate solution, a white insoluble precipitate of barium sulphate is formed along with a solution of sodium chloride.
BaCl2 + Na2SO4 ā¶ 2NaCl + BaSO4ā
On weighing the apparatus before and after the reactions it is found that:
Total mass of the apparatus + reactants = Total mass of the apparatus + products
This observation verifies the law of conservation of mass.
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