To prepare a collidial solution of ink+water and honey+water
Answers
It is the amount of solute present in a given amount of solution. Amount of solute
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
EXPERIMENT 2
Aim
To prepare:
a true solution of common salt, sugar and alum in water.
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 criterion
stability
Theory
True solution: A solution that has solute particles of size smaller than 1 nm (10-9 metres) in diameter, and cannot be seen with naked eyes. They do not scatter a beam of light, the particles do not separate by filtration and the particles do not settle down.
Suspension: It is a heterogeneous mixture in which solute particles do not dissolve but remain suspended, particles can be seen with naked eyes, it scatters a beam of light, particles can be separated from the mixture by filtration.
Colloidal solution: The solution appears to be homogeneous, the particles can scatter a beam of light, they do not settle down when left undisturbed, it is stable and particles cannot be seen by naked eyes. The particles cannot be filtered. The size of particles is between 10-7 cm to 10-4 cm in diameter.
Properties of True Solutions
A true solution is a homogeneous mixture of solute and solvent.
The particle size of solute is less than 1 nm (1 nm =10-9m).
The components do not scatter light and do not show Tyndall effect.
The particles cannot be separated by filtration.
The solution is stable (remains uniform).
The solution is transparent.
Properties of Colloid
It is a heterogeneous solution but appears to be homogeneous.
The particle size of solute is 1 nm-1000 nm. (10-9-10-6 m)
The components scatter light and shows Tyndall effect.
The particles can be separated only by centrifugation.
The solution is stable.
The solution is translucent.
Properties of Suspension
It is a heterogeneous mixture.
Particle size is more than 1000 nm (10-6 m) and can be seen with naked eyes.
The particles of suspension, in its suspended form scatter a beam of light, i.e., shows Tyndall effect.
It is unstable.
The particles can be separated by filtration.
It is opaque.
Materials Required
Beakers (250 mL), an iron stand, a glass rod, bunsen burner, test tube stand, three funnels, three tripod stands, filter papers, a small torch and China dish.
Chemicals Required
Common salt, sugar crystals, alum powder, chalk powder, fine sand, raw egg, fine soil from garden and distilled water.
Procedure
To prepare a true solution of common salt, sugar and alum in water.
True solution of common salt:
Take a clean and dry beaker, pour 100 mL of distilled water in it and add dry common salt in it.
Stir the content with a glass rod. Common salt dissolves completely to form a true solution.
True solution of sugar:
Take a clean and dry beaker and add 100 mL of distilled water in it, pour few sugar crystals in it arid stir the content with a glass rod. The sugar dissolves in wat
Answer: to prepare a collidial solution of ink + water and honey + water
it is a heterogeneous solution
Explanation:
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