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Introduction to Colloids

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Q8. Can a mixture of two liquids be separated by sedimentation and decantation? Explain and provide an example.

Q9. How would you separate a mixture of kidney beans, salt, water and puffed rice? Make a flow chart to show the steps and processes involved.

Q10. Is distilled water good for drinking ? Why or why not? Solve this:

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Solution

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Answer 10:

Distilled water is not good for drinking. Our body is in constant need of electrolytes, which we supply through drinking water. Distilled water has no electrolytes present in it and when we drink it, the electrolytes already present in our body fluids will dissolve in it and will be washed out. This could lead to excessive deficiency of electrolytes in our body.

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Q. Can sedimentation and decantation be used to separate a mixture of salt and water ?

Q. State whether the following statements are true or false.

(a) A mixture of oil and water can be separated by filtration.
(b) Water can be separated from salt by evaporation.
(c) A mixture of wheat grains and wheat flour can be separated by sieving.
(d) A mixture of iron filings and rice flour can be separated by a magnet.
(e) A mixture of wheat grains and rice flakes can be separated by winnowing.
(f) A mixture of tea leaves and milk can be separated by decantation.

Q. Select a suitable word from those given and write it in the space provided:
sieving, winnowing, loading, evaporation, decantation, filtration, condensation, distillation, sedimentation, sublimation
(a) After pounding, rice is separated from its husk by ______________ .
(b) A mixture of stones is allowed to fall through wire nets in order to separate them according to different sizes. This is a process of ______________ .
(c) When muddy water is kept overnight in a bucket, the clear water can be poured off from the top, next morning. This is a process of ________________ .
(d) Chilled milk is poured through a muslin cloth to remove the layer of cream. This is a process of _____________ .
(e) Salt is obtained from sea water by _____________ .
(f) Solid iodine can be separated from sand by ____________ .
(g) _____________ is used to separate immiscible liquids.
(h) The process of settling down of heavy solid particles at the bottom of a container coantaining a mixture of a liquid and an insoluble solid is _______________ .

Q. True or false?
(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing.
(c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with the process of decantation.

Q. You are provided with a mixture of salt, sand, oil, and water. Write the steps involved for the separation of salt, sand, and oil from the mixture by giving an activity along with the diagram.

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