Rekha and Harish were newly married. Rekha’s father is a government contractor and is
very rich. Before marriage Rekha enjoyed all sort of lavishness, she never washed clothes
never done any cooking and there were many things to which she was new. One day Harish
asked her to make a lemonade for him. Although Rekha never went to kitchen yet she had
an idea that to make a lemonade all she needed is a lemon, water sugar and ice and she
knew that all these things are required to be mixed well. Being new to the kitchen she
added ice to the water first and then started dissolving sugar crystal to the cold water.
Contrary to her thought she found it very difficult to dissolve sugar crystals to cold waterwhere as she had observed her mother to dissolve sugar crystals in water very easily. She
was unable to find what the problem is.
Q1. Why Rekha was unable to dissolve sugar in water as easily as her mother?
Q2. What had she done to make the process easy?
Q3. What is the effect of temperature on solubility?
Q4. What is saturated solution?
Q5. How can a solution be made unsaturated by changing temperature?
Answers
Q1. Why Rekha was unable to dissolve sugar in water as easily as her mother
ans: When sugar dissolved in water it is not visible as the sugar particles have filled the spaces between the water particles.
Q3. What is the effect of temperature on solubility?
ans:The solubility of most of the salts increases in with increase in temperature. But for same salts like sodium chloride there is no effect of temperature on the solubility. For same salts like Cerium sulphate the solubility decreases with increase in temperature.
Q4. What is saturated solution?
ans: A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent. The additional solute will not dissolve in a saturated solution.
Q5. How can a solution be made unsaturated by changing temperature?
ans: If the solubility of the solute in the solvent is directly proportional to the temperature, then increasing the temperature of the system will make a saturated solution unsaturated.
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