what will be the inference of true solution of common salt in water when a beam of torch light is passing through...
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Answer:
Introduction
Solution: It is a homogeneous mixture of two or more substances. Solutions can be solid solutions e.g. alloys; liquid solutions e.g. lemonade and gaseous solutions e.g. air.
A solution is made up of solute and solvent.
Solute: The component of the solution that is dissolved in the solvent is called the solute.
Solvent: The component of the solution that dissolves the other component in it is called solvent.
Concentration of a Solution
It is the amount of solute present in a given amount of solution. Amount of solute
concentration\quad of\quad a\quad solution\quad =\quad \frac { Amount\quad of\quad solute }{ Amount\quad of\quad solution }
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.
Types of True Solution: Depending on the nature of solute and solvent, we can get variety of solutions.
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.
The particles of a suspension scatter a beam of light passing through it and make its path visible.
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.
Types of Colloids
NCERT Class 9 Science Lab Manual - Solution, Colloids, Suspension 1
The solution is homogeneous and does not settle.
Is common salt in water a true solution?
Salt water is a true solution and is not a colloid. It is a true solution since salt particles completely dissolve in water.