Activity & Practical on Separation of Mixture | Separation of salt by Evaporation method | Class 9 Science-EduGrown

The salt does not evaporate and so it stays behind.

Salt solution is heated.
Water evaporates and its vapours rise. The water vapour passes into the condenser, where it cools and condenses. Liquid water drips into a beaker.
All the water has evaporated from the salt solution, leaving the salt behind.

Aim

To separate the components of a mixture of salt and water by Evaporation Method

A China dish, tripod stand, a wire gauze, a bunsen burner, glass funnels, a glass rod, a beaker, filter paper, a clamp stand.

Chemicals Required

Natural substances are not chemically pure. Different methods of separation are used to get individual components from a mixture. But, before separating any components from a mixture one must have sound knowledge of its physical and chemical properties so that separation can be done with ease.
Salt and water form a heterogeneous mixture which can be separated easily through simple physical methods of separation.

Evaporation
Separation of common salt.

The filtrate obtained in the beaker in previous step consists of common salt solution. Transfer it to the china dish.
Place the china dish on tripod stand with bunsen burner and heat it in low flame (controlled heating) till all water gets evaporated.
The salt is collected in the china dish, as all the water is evaporated.

The salt does not evaporate and so it stays behind.

Salt solution is heated.
Water evaporates and its vapours rise. The water vapour passes into the condenser, where it cools and condenses. Liquid water drips into a beaker.
All the water has evaporated from the salt solution, leaving the salt behind.

Salt and water get separated

Be careful during heating experiments.
Prolonged heating should be avoided.
Keep the flame low if you are using bunsen burner.
Use clean and dry apparatus.
Use distilled water for making solution.
While filtering ensure that the filter paper cone does not tear up and allow the mixture to pass slowly through it.
During sublimation, you can keep an extra plugged funnel to collect the dense white fumes.

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