Materials Required
- Kip’s apparatus to get Hydrogen Sulphide gas
- Concentrated Nitric acid
- Common salt
- Chalk powder
- Funnel
- Four boiling tubes
- Glass rod
- Test tube stand
- Filter paper
The Procedure
Real Lab Procedure
(i) Preparation of Colloidal Solution of Sulphur
- Take about 20 mL of distilled water in a boiling tube and pass H2S gas through it for about 5 minutes.
- Warning: The solution would smell like a rotten egg.
- Add a few drops of concentrated Nitric acid to it. Stir the solution. Continue adding a few drops of Nitric acid until the solution becomes milky.
- Transfer the contents into another clean boiling tube. Label this boiling tube as tube A.
(ii) Preparation of True Solution
- Take about 20 mL of distilled water in a clean boiling tube.
- Add approximately 1- 2 g of Sodium Chloride (or common salt).
- Stir the solution till it becomes clear. Label this boiling tube as tube B.
(iii) Preparation of suspension
- Take about 20 mL of distilled water in another clean boiling tube.
- Add approximately 1- 2 g of Powdered Chalk into it.
- Stir the mixture with the help of a glass rod. Label this boiling tube as tube C.
Simulator Procedure
i) Preparation of Colloidal Solution of Sulphur
- Click and drag distilled water bottle.
- Drop it to the boiling test tube to pour 20ml of water.
- Click and drag kip's apparatus contain Hydrogen Sulphide gas.
- Drop it to the boiled test tube.
- Click and drag the dropper that contain Concentrate Nitric acid.
- Drop it into the boiled test tube.
- Add few drops to the boiled test tube.
- Drag and stir the boiled test tube.
- Drag the boiled test tube.
- Drop it to another boiled test tube.
- Add label(A) for the test tube by clicking the button.
ii) Preparation of True Solution
- Click and drag distilled water bottle.
- Drop it to the boiling test tube to pour 20ml of water.
- Drag the spatula and drop it on the watch glass.
- Drag spatula that contain 1-2 gm of Sodium Chloride.
- Drop it to the test tube.
- Drag and stir the test tube where solution become clear.
- Drag and drop the boiled test tube to the stand.
- Add label(B) for the test tube by clicking the button.
iii) Preparation of suspension
- Click and drag distilled water bottle.
- Drop it to the boiling test tube to pour 20ml of water.
- Drag the spatula and drop it to the watch glass.
- Drag the spatula that contain 1-2 g of Chalk power.
- Drop it to the test tube.
- Drag and stir the test tube.
- Drag and drop the boiled test tube to the stand.
- Add label(C) for the test tube by clicking the button.
- Click next Button.
- Click and drag the funnel.
- Drop it into the boiled test-tube.
- Repeat the step for 3 boiled test tubes.
- Drag and drop the filter paper to the 3 boiled test tubes.
- Click and drag boiled test tube A.
- Drop it to the first Boiled test tube that contain filter paper.
- Repeat the step for B and C test tube.
Observation
Sl. No.
|
Experiment Boiling tube
|
Inference
|
1. Transparency
Observe the contents of different boiling tubes.
|
A
|
|
B
|
|
C
|
|
2. Filtration
Filter the contents of different tubes through ordinary filter paper.
|
A
|
|
|
B
|
|
|
C
|
|
Result
- A true solution is homogenous and transparent. It can be completely filtered through filter paper. It remains stable on standing.
- A colloidal solution is heterogeneous. It appears translucent. It can be filtered completely through filter paper. Here solute particles do not easily settle down on standing.
- A suspension is a heterogeneous mixture. The particles of a suspension are visible to the naked eye. They settle down on standing and can be separated by filtration.
Precautions
- Keep the sample undisturbed while checking stability.
- Handle acids carefully.
