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Which separation techniques will you apply for the separation of the following?

Sodium chloride from its solution in water.


Crystallization or evaporation

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To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature. 


Mass of sodium chloride = 36g
Mass of solution =100g
Mass of the solution = 100+36g =136g
Concentration of the solution = 36/136 x 100 =26.47%

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What is meant by a substance?


A substance which consists of a single type of particle and it cannot be separated into other kinds of matter by any physical process is called a substance.

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Differentiate between homogenous and heterogeneous mixtures with examples.


s.no

Homogenous mixture

Heterogeneous mixture

1.

It has a uniform composition throughout its mass

It has no uniform composition.

 

2.

It has no visible boundary or boundaries of separation between its constituents. For example solution of sugar and salt.

It has visible boundary or boundaries of separation. For example mixture of sugar and sand.



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To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.


Mass of sodium chloride = 36 g
Mass of water = 100 g
Mass of solution = 100+36 = 136 g


Concentraction of solution =Mass of soluteVolume of solution 

Thus,

36136 x 100  =26.47%

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List the points of differences between homogeneous and heterogeneous mixtures.


Homogeneous mixture

Heterogeneous mixture

It is the mixture in which different constituents are mixed uniformly.

It is the mixture in which different constitutes are not mixed uniformly

They cannot have physically distinct parts.

They have physically distinct parts.

The constituents cannot be easily seen.

The constituents can be easily seen.

The constituents cannot be easily separated.

The constituents can be easily separated.

Example: sugar solution, soda water, soft drinks, vinegar, air etc.

Example: sugar and sand mixture, milk, ink, paint, etc.

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