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(i) If a saturated solution is heated to a higher temperature, it becomes unsaturated. (ii) If a saturated solution is cooled to a lower temperature, some of its dissolved solutes get separated in the form of solid crystals by the process of crystallization. What happens when a supersaturated solution is allowed to cool at room temperature?if cooled carefully the supersaturated solution will stay liquid unless disturbed or seeded with a seed crystal. What happens when separated solution is allowed to cool? As the solution cools, the solvent can no longer hold all of the solute molecules, and they begin to leave the solution and form solid crystals. During this cooling, each solute molecule in turn approaches a growing crystal and rests on the crystal surface. What will happen if a saturated solution at a higher temperature is allowed to cool down to room temperature? Because the solubility of most solids increases with increasing temperature, a saturated solution that was prepared at a higher temperature usually contains more dissolved solute than it would contain at a lower temperature. When the solution is cooled, it can therefore become supersaturated (Figure 13.2. What would you observe when 3 a a saturated solution of potassium chloride prepared at 600 is allowed to cool at room temperature?(a) When a saturated solution of potassium chloride prepared at 60∘C is allowed to cool at room temperature, crystals of potassium chloride will be formed. (b) Initially, sugar will obtained as water wil get evaporated. But on dry heating sugar gets charred and it turns back. What would be observed if a saturated solution of potassium chloride at 80 degree Celsius is left to cool to the room temperature?temperature, crystals of potassium chloride will be formed. it turns black. What happens when saturated solution is allowed to cool slowly and why? If a saturated solution is heated, then it becomes unsaturated because solubility of solute increases on heating. If a saturated solution is cooled, then some of its dissolved solute will separate out in the form of solid crystals. What happens when we decrease the temperature of a saturated solution? On decreasing the temperature of a saturated solution or cooling it basically the solubility of the solute decreases. It starts forming crystals and settles down at the bottom of the container or vessel. This results in the formation of a supersaturated solution. Related
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warning Report Error Page 20Answer: (a) Alloys are homogeneous mixtures of metals, because (i) it shows the properties of its constituents, and (ii) it has variable composition., e.g., brass is considered a mixture, because it shows the properties of its constituents, copper and zinc, and it has a variable composition (amount of Zn in brass can vary from 20 to 35 per cent). (b) A solution is generally a liquid, not always. It may involve solids and gases also, e.g., alloys are solution of solid in solid. Air is solution of gases in gases. (c) Colloidal solutions are heterogeneous in nature, though they appear to be homogeneous, Page 21
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