practical class 9 Preparation of: Unit-I
a) a true solution of common salt, sugar and alum
b) a suspension of soil, chalk powder and fine sand in water
c) a colloidal solution of starch in water and egg albumin/milk in water and distinguish
between these on the basis of
• transparency
• filtration criterion
• stability
Answers
Answer:
Not know answer sorry.
1 . It is the amount of solute present in a given amount of solution. Amount of solute
concentration of a solution = Amount of solute / Amount of solution .
2 . A solution is always transparent, light passes through it without scattering as the solute particles are very small in size. The solution is homogeneous and does not settle. A solution cannot be filtered but can be separated using the process of distillation. For example, a solution of sugar in water.
3 . Types of True Solution:
Depending on the nature of solute and solvent, we can get variety of solutions.
4 . A suspension is cloudy and heterogeneous mixture. The particles are larger than the particles of solution and can be filtered. A suspension settles when it is allowed to stand for some time. The particles can be seen with the naked eyes.
5 . The particles of a suspension scatter a beam of light passing through it and make its path visible.
6 . A colloid particle size is intermediate between a solution and a suspension. It does not separate out on standing and cannot be filtered. Colloids show the Tyndall effect. Light passing through a colloid shows dispersion. It is homogeneous to naked eyes, e.g. milk.
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