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.
Notes
Matter in Our Surroundings - Notes
1. 3. Non-Metals are Bad Conductors of Heat and Electricity.
Show Notes
3. The Case of a Liquid Solute Dissolved in a Liquid Solvent
Show Notes
4. 11. Metals Usually Have a Silver or Grey Colour
Show Notes
7. Separation Of Mixture Of a Solid And a Liquids
Show Notes
10. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
Show Notes
11. To Study the Properties of a Colloid
Show Notes
13. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
Show Notes
17. 1. Separation by a Suitable Solvent
Show Notes
20. To Study the Properties of a Compound of Iron and Sulphur
Show Notes
21. 11. Non-Metals Have Many Different Colours.
Show Notes
22. 6. Metals are Usually Strong. They Have High Tensile Strength.
Show Notes
26. To Study the Properties of a Solution
Show Notes
32. 3. Metals are Good Conductors of Heat and Electricity.
Show Notes
33. Separation of Mixture Of Two Solids
Show Notes
37. To Study the Properties of a Suspension
Show Notes
38. Chemical Formula for daily use material
Show Notes
42. To Separate a Mixture of Alcohol and Water
Show Notes
47. 1. Separation by Fractional Distillation
Show Notes
50. To Separate the Salt-Water Mixture (or Salt-Solution)
Show Notes
