Question

100 ml of water at room temperature of 25 degree Celsius is taken in a beaker and a little solid S is dissolved in it by stirring to obtain solution X more of solid S is added to the solution with constant steering while keeping the temperature of the solution constant at 30 degree Celsius. After sometime it is observed that no more solid dissolves in water and at the same time some solid is also left and dissolved at the bottom of the beaker the contents of the beaker are filtered through a filter paper to obtain solution why in the form of filtrate.

(a) what is the solution like X called?

(b) what is the solution like Y called?

(c) what will you observe if the solution Y at 30 degree celsius is cool down to 10 degree Celsius by keeping the beaker in crushed ice?Why?

(d) what term is used to denote the solid dissolved in 100 grams of water in solution like Y?

Answer 1

(a) What is the solution like X called?

• The solution like X is called saturated solution.
• A saturated solution is a solution that contains the maximum amount of solute that can be dissolved in it.
• Increasing its temperature can dissolve more solute in a saturated solution.

(b) What is the solution like Y called?

• The solution like X is called super saturated solution.
• A supersaturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature.

(c) What will you observe if the solution Y at 30 degree Celsius is cool down to 10 degree Celsius by keeping the beaker in crushed ice? Why?

• If the solution Y at 30 degree Celsius is cooled down to 10 degree Celsius, some of the dissolved solids will separate from the solution and settle down at the bottom of the beaker.
• This happens because of the solubility of solid decreases on cooling.

(d) What term is used to denote the solid dissolved in 100 grams of water in solution like Y?

• The term used to denote the solid dissolved in 100 grams of water in a solution like Y is the solubility.
• The solubility is the maximum amount of solute that can be dissolved in a specific quantity of solvent at a certain temperature.

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