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Is Matter Around Us Pure
Question
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List the point of difference between homogeneous and heterogeneous mixtures.

Answer

Differences between homogeneous and heterogeneous mixtures :

Homogeneous mixture

Heterogeneous mixture

(i) It has no visible boundary or boundaries of separation between its constituents.

(i) It has visible boundary/boundaries of separation between its constituents.

(ii) It has a uniform composition throughout its mass.

(ii) The composition of the mixture varies from mass.

For example, sugar in water, salt in water, Sulphur in carbon disulphide, water and alcohol etc.

For example, sand and salt, sugar and salt, wood blood, water in oil etc.

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Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66