To Prepare a Saturated Solution
We will describe the preparation of a saturated solution of a substance, say sodium chloride,at a temperature of 30°C. We take some water in a beaker and heat it slowly with the help of a burner.Now,we start adding sodium chloride salt to the hot water with a spoon and stir it with a glass rod continuously so that sodium chloride goes on dissolving in water.We take the temperature of water up to 30°C and then keeping this temperature constant,go on adding sodium chloride till no more sodium chloride dissolves in it and some sodium chloride is also left undissolved at the bottom of the beaker. The contents of the beaker are now filtered through a filter paper arranged in a funnel. The clear solution obtained in the form of "filtrate" is the saturated solution of sodium chloride at 30°C.
We will now describe what happens when a saturated solution of sodium chloride at 30°C is allowed to cool. If a saturated solution of sodium chloride at 30°C is allowed to cool, then the crystals of solid sodium chloride will reappear in the solution.Actually, on cooling the solution, the solubility of sodium chloride in water decreases due to which some of the dissolved sodium chloride separates out from the solution and forms crystals. We will now discuss the solubility of solutes.
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Matter in Our Surroundings - Notes
1. 11. Metals Usually Have a Silver or Grey Colour
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2. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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9. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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10. 1. Separation by a Suitable Solvent
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11. 6. Metals are Usually Strong. They Have High Tensile Strength.
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19. Chemical Formula for daily use material
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20. 4. Metals are Lustrous (or Shiny), and can be Polished.
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22. To Study the Properties of a Compound of Iron and Sulphur
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29. To Separate a Mixture of Alcohol and Water
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31. 3. Metals are Good Conductors of Heat and Electricity.
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32. To Study the Properties of a Solution
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33. 7. Metals are Solids at the Room Temperature
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34. To Study the Properties of a Colloid
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42. To Study the Properties of a Suspension
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43. To Separate the Salt-Water Mixture (or Salt-Solution)
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45. Experiment to Obtain Coloured Component (Dye) From Ink
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