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Preparation of a Suspension of Soil, Chalk Powder and Fine Sand in Water

Preparation of a Suspension of Soil, Chalk Powder and Fine Sand in Water

  1. Solution: A solution is a combination of two or more substances that is homogenous in nature. Solid solutions, such as alloys, liquid solutions, such as lemonade, and gaseous solutions, such as air, are examples of possible solutions. Solute and solvent combine to form a solution.
  2. Solute: The solute is the part of the solution that is dissolved in the solvent.
  3. Solvent: Solvent is the component in a solution that dissolves the other components in it.

Aim:

To prepare a suspension of soil, chalk powder and fine sand in water and distinguish between these on the basis of transparency, filtration criterion, and stability.

Theory:

The particle size in suspension is on the order of 10-5 cm or greater, which may be observed with the naked eye or under a microscope. The suspensions were not particularly stable, and after a few minutes, the suspended particles settled down.

Properties of Suspension:

  1. It is a mixture that is heterogeneous in nature.
  2. Particles with a diameter greater than 1000 nm (10-6 m) can be seen with the naked eye.
  3. The suspension particles scatter a beam of light in their suspended state, which is known as the Tyndall effect.
  4. It’s in a state of instability.
  5. Filtration could be used to separate the particles.
  6. It is opaque in nature.

Materials Required:

Beakers, Test tubes, Soil, Chalk powder, Fine sand, Glass Rod, Water.

Procedure:

Step 1: Fill three beakers with 100 mL of water and label them A, B, and C, respectively.

Step 2: In each beaker, 10g of fine soil (without litter), fine chalk powder, and fine sand are added separately.

Step 3: Using the glass rod, stir the solution.

Step 4: Label the test tubes as A, B, and C to identify the solutions.

Observation Table:

Property

Experimental Procedure

Observation

Inference

Transparency

Each test tube has a small strip of cellophane paper glued on it, and the coloured paper of each test tube can be seen from the other side.

From the other side of the test tube, the coloured spot is not visible.

A suspension is opaque in nature.

Filtration Criterion

Filtrate the contents of test tubes labelled A, B, and C.

The filter paper shows a particle suspension, yet the filtrate is a clear liquid.

Filtration can separate the suspended components of a suspension.

Stability

Allow 20-25 minutes for the test tubes to rest without being disturbed.

Solid particle settlement can be observed at the bottom.

The suspensions are not stable and contain heavy components deposited.

Results and Discussion:

Suspensions are opaque in nature. On filtration, they left residue on the filter paper. The filtrate is clear or translucent in appearance.

Precautions to be taken during the experiment:

(i) Handle the materials and solutions with care.

(ii) While filtering a solution, pour the contents into the funnel using a glass rod.

(iii) Do not disturb the sample during the stability test.

Viva Voce

1. Give one use of suspension.

Suspensions are used in medicines.

2. How can you make a saturated solution unsaturated?

On heating, a saturated solution becomes unsaturated.

3. What is Tyndall effect?

The Tyndall effect is referred to the scattering of a light beam.

4. Give three examples of solvents, commonly used.

Water, acetone, alcohol.

5. At 25°C, a saturated solution was obtained. What happens if the temperature is kept at 40°C?

Because solubility increases as temperature rises, the solution will become unsaturated.

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