what precautions should be taken by verifying law of conservation of mass in a chemical reaction between aqueous solution of Barium Chloride and sodium sulphate
Answers
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.
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 settles 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.