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Doctors Medicines MCQs Q&A

i. Dissolve a given amount of sugar in minimum amount of water at room temperature. 

ii. Increase the temperature and dissolve more amount of sugar in the same amount of water to make a thick sugar syrup solution.

iii. Cool the syrup to the room temperature.

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1 Answers

Observation :

Sugar crystals separate out. Inference : 

The sugar syrup solution prepared is a saturated solution. 

Therefore,

Additional amount of sugar cannot be dissolved in it at room temperature. 

In a saturated solution,

There exists dynamic equilibrium between the solute molecules in the solid state and in dissolved state. 

Sugar(aq) ⇌ Sugar(s) 

The rate of dissolution of sugar = The rate of crystallization of sugar. 

However, when it is heated, 

Additional amount of sugar can be dissolved in it. 

But when such a thick sugar syrup is cooled again to room temperature, sugar crystals separate out.

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