Is Matter Around Us Pure

Question

How would you confirm that colourless liquid given to you is pure water?

Solution

Every liquid has a characteristic boiling point at 1 atmospheric pressure. Boiling point of pure water is 373K at 1 atomspheric pressure. If the given sample is colourless liquid and boils at exactly 373K at 1 atmospheric pressure, then it is pure water. If the boiling point is even slightly above 373K, then it is contaminated.

Some More Questions From Is Matter Around Us Pure Chapter

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Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

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

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Is Matter Around Us Pure

How would you confirm that colourless liquid given to you is pure water?

Some More Questions From Is Matter Around Us Pure Chapter

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

Different pigments from an extract of flower petals.

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

Butter from curd.

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

Oil from water.

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

Tea leaves from tea

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

Iron pins from sand.

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

Wheat grains from husk

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

Fine mud particles suspended in water.

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

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Loaction

Substance Dissolved	Temperature in K
Substance Dissolved	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

For Daily Free Study Material Join wiredfaculty

Is Matter Around Us Pure

How would you confirm that colourless liquid given to you is pure water?

Some More Questions From Is Matter Around Us Pure Chapter

Which separation techniques will you apply for the separation of the following?Different pigments from an extract of flower petals.

Which separation techniques will you apply for the separation of the following?Butter from curd.

Which separation techniques will you apply for the separation of the following?Oil from water.

Which separation techniques will you apply for the separation of the following?Tea leaves from tea

Which separation techniques will you apply for the separation of the following?Iron pins from sand.

Which separation techniques will you apply for the separation of the following?Wheat grains from husk

Which separation techniques will you apply for the separation of the following?Fine mud particles suspended in water.

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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

Different pigments from an extract of flower petals.

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

Butter from curd.

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

Oil from water.

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

Tea leaves from tea

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

Iron pins from sand.

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

Wheat grains from husk

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

Fine mud particles suspended in water.