1. Explain the process and precautions in verifying law of conservation of mass.
(AS)
Answers
Answer:
Precaution: To initiate the chemical reaction tilt the flask efficiently so that barium chloride solution gets mixed with the sodium sulphate solution in the flask. The mass of both of the solution before reaction was found to be same after the product is formed. So, this verifies the law of conservation of mass.
Answer:
The sodium sulphate solution is to be taken 5ml in a conical flask.
Add 5ml of barium chloride in a get spills with the sodium sulphate solution and a white precipitate is formed.
Take 5ml of sodium sulphate solution pour it into a conical flask.
The content of the flask should be measured in the end.
Precaution:
To initiate the chemical reaction tilt the flask efficiently so that barium chloride solution gets mixed with the sodium sulphate solution in the flask.
The mass of both of the solution before reaction was found to be same after the product is formed. So, this verifies the law of conservation of mass.
OR
Process:
Take 5ml of sodium sulphate solution in a measuring cylinder and pour it into a conical flask.
Take about 5 ml of barium chloride solution in another measuring cylinder and pour it into a 10ml test tube.
Tie the test tube using a thread and hang the test tube in the conical flask carefully, so that the solutions do not mix with each other.
Put a cork in the mouth of the flask so that the thread holding the test tube is held firmly in place.
Carefully weigh the flask on a weighing balance and note the reading.
Tilt and swirl the flask so that barium chloride solution in the test tube spills and mixes with sodium sulphate solution in the flask and forms a white coloured precipitate of barium sulphate (BaSO4)and an aqueous solution of sodium chloride (NaCl).
Wait for 10 min. to complete the reaction. The white precipitate setties down to the bottom of the flask.
Weigh the contents of the flask again and note the reading.
Precautions
When setting up the apparatus, and while taking the first reading of the total mass of apparatus and reactants, care must be taken that the barium chloride solution in the ignition tube does not spill and mix with the sodium sulphate solution in the conical flask.
To start the chemical reaction, tilt and swirl the flask well so that barium chloride solution in the ignition tube spills and mixes with sodium sulphate solution in the flask.
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