Double Displacement Reaction

Materials required:

Procedure:

Real Lab Procedure:

  • Take 2ml of sodium sulphate solution in a test tube.
  • Take 1ml of barium chloride solution in another test tube.
  • Add barium chloride solution to sodium sulphate solution.
  • Observe the change.

Simulator Procedure (as performed through the Online Labs)

  • To pour barium chloride solution (BaCl2) into the test tube, drag the dropper towards it.
  • To pour sodium sulphate solution (Na2SO4) into the same test tube, drag the dropper towards it.
  • You can see that a white precipitate is formed in the test tube.
  • See the inference by clicking on the inference icon.
  • To see the zoomed view of the test tube, click on it.
  • To go back to the previous screen, click on the ‘Back’ button.
  • Drag the test tube towards the beaker to decant the upper solution into it.
  • To pour dilute HCl into the test tube containing the white precipitate, drag the dropper towards it.
  • After shaking, you can view the zoomed view of the test tube by clicking on it.
  • To go back to the previous screen, click on the 'Back' button.
  • You can see the inference by clicking on the inference icon.
  • You can click the ‘Reset’ button to redo the experiment.

Note: Click on the ‘HELP’ button to see the instructions.

Observation:

  • A white precipitate appears that is insoluble in dilute HCl.

Inference:

  • When sodium sulphate chemically reacts with barium chloride in the form of their aqueous solutions, white precipitate of barium sulphate appears. This confirms the presence of sulphate (SO42-) ions.


                                                                                                                                                     

  • It is a double displacement reaction in which sulphate ions are displaced by chloride ions and chloride ions are displaced by sulphate ions.

 Precautions:

  1. Use the chemicals judiciously.
  2. Keep the mouth of the test tube away from your face and also from other classmates.
  3. Handle the acids and alkali carefully.

So, try it out and “Have a safe lab!”

 

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