write the steps of the preparation of true solution , suspension and colloidal solution.
Answers
Explanation:
AIM
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.
To prepare a true solution of alum powered alum mixed in water with constant stirring to avoid formation of lumbs. Solute particles i e,alum powder dissolved in solvent to form a true solution of alum. It is transparent and clear solution.