to prepare a true solution suspension and colloidal solution and distinguish these on the basis of transparency filtration and stability
Answers
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To prepare
A true solution of common salt, sugar and alum.
A suspension of soil, chalk powder and fine sand in water.
A colloidal solution of starch in water and egg albumin in water and distinguish between these on the basis of
transparency
filtration
stability.
MATERIALS REQUIRED
Test tubes, beakers, water, common salt, sugar, alum, soil, chalk powder, fine sand, egg albumin, starch, funnel, glass rod, filter paper.
THEORY
A true solution has particle size < 10-9 m. It is a homogeneous mixture which is clear and transparent. It passes through the filter paper easily and is stable.
Colloid has particle size 10-9 m- 10-6 m. It is heterogeneous and is translucerft. It passes through filter paper and is stable.
The particle size of Suspension is >10-6 m. It is heterogeneous and opaque. Its particles do not pass through filter paper and settle under gravity when left undisturbed for sometime.
PROCEDURE
Preparation of solutions/mixtures
Take 8 beakers and label them as A, B, C, D, E, F, G and H and add 50 ml of water to each of these beakers.
Add samples of salt, sugar and alum to beakers A, B and C. Stir to make clear solution.
Add soil, chalk powder and fine sand to beaker D, E and F. Stir for sometime.
Add a small amount of starch to the water and boil the content in beaker G.
In beaker H, add egg albumin and stir vigorously.
Observe the mixture and record them in the table given below.
OBSERVATION TABLE
cbse-class-9-science-practical-skills-solution-colloids-suspension-1
cbse-class-9-science-practical-skills-solution-colloids-suspension-2
cbse-class-9-science-practical-skills-solution-colloids-suspension-3
cbse-class-9-science-practical-skills-solution-colloids-suspension-4
RESULTS
Beaker A – Common salt forms a true solution in water.
Beaker B – Sugar forms a……………. in water.
Beaker C – Alum forms a …………….in water.
Beaker D – Soil forms a……………. in water.
Beaker E – Chalk Powder forms a……………. in water.
Beaker F – Fine sand forms a……………. in water.
Beaker G – Starch forms a……………. in water.
Beaker H – Egg albumin forms a …………….in water.
PRECAUTIONS
Distilled water should be used.
The components should be mixed in small amounts.
Fold the filter paper properly and moisten it before use.
Glass rod should be clean.
Wash your hands properly with soap after experiment.
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Answer:
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.
Colour spot is evidently seen on test tubes when seen from the other side.
A true solution is transparent.
Filtration Criterion
Filtrate the contents of test tubes labelled A, B, and C.
There is no residue on the filter paper, and the filtrate is clear.
Filtration cannot separate solid particles from true solution.
Stability
Allow 20-25 minutes for the test tubes to rest without being disturbed.
There is no change in the solutions.
True solutions are stable and do not exhibit component deposition.
Results and Discussion:
True solutions are clear and transparent. They pass through the filter paper without leaving any trace. The filtrate is translucent as well.
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.