Class 9 Notes | EduRev

Science Class 9

Class 9 : Class 9 Notes | EduRev

The document Class 9 Notes | EduRev is a part of the Class 9 Course Science Class 9.
All you need of Class 9 at this link: Class 9

Materials required:

  • A conical flask
  • 10ml test tube
  • Measuring cylinders
  • Thread
  • Cork
  • Electronic balance
  • Barium chloride (BaCl2) solution
  • Sodium sulphate (Na2SO4) solution

Real Lab Procedure:

  • 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.

Simulator Procedure:

  • In order to start the simulator, click on the measuring cylinder containing 5 ml sodium sulphate solution to pour it into the conical flask.
  • Click on the measuring cylinder containing 5 ml barium chloride solution to pour it into the 10 ml test tube.
  • Click on the thread to tie the test tube with the thread.
  • Click on the button,  ‘NEXT STEP’ to proceed further.
  • Click on the test tube to hang it in the conical flask.
  • The conical flask is being closed with a cork.
  • Click on the conical flask to place it on the balance and weigh it with all the contents. 
  • Note the reading on the balance.
  • Click on the conical flask to tilt it and swirl it to mix both the solutions, ,the formation of a white precipitate occurs. 
  • Click on the information icon to see the inference.
  • Click on the conical flask to weigh it again.
  • Again note the reading on the balance.
  • Click on the information icon to see the inference.
  • You can redo the experiment anytime by clicking on the ‘Reset’ button.

Observations:

  • Mass of total apparatus + Mass of reactants = (M + m1) g
  • When barium chloride solution in the test tube mixes with the sodium sulphate solution in the conical flask, a white precipitate is formed.
  • Mass of total apparatus + Mass of products = (M + m2) g

Conclusions:

  • Aqueous solution of barium chloride reacts with that of sodium sulphate to form a white precipitate of barium sulphate and an aqueous solution of sodium chloride.

BaCl2(aq) + Na2So4(aq) → BaSo4(s) + 2NaCl (aq)

m1=m2

i.e., in a chemical reaction,

Total mass of reactants = Total mass of products

  • Since the mass of total apparatus M remains constant,
  • Thus, the Law of Conservation of Mass is verified.
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