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Is Matter Around Us Pure
Explain the methods by which you would separate camphor from sodium chloride.
Camphor would separate from sodium chloride by sublimation or Filtration.
(i) Sublimation: Mixture of camphor and sodium chloride is heated in a china dish covered with an inverted funnel closed from the lower end. Camphor sublimes and collects on the inner wall of the funnel. Sodium chloride is left as residue in china dish.
(ii) Filtration. Dissolve the mixture in water. Sodium chloride dissolves in water while camphor remains as residue. It is then filtered. Residue left on filter paper is camphor. Sodium chloride is then recovered from water by evaporation.
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Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
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.
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 |
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