3 Give reasons for the following.
1. Solubility curves find utility in separation and purification of solutes.
2. Pressure and temperature influence the solubility of gases in water.
3. Heating a hydrated copper sulphate crystal is deemed a chemical change.
Efflorescence is minimum during humid conditions.
5. A crusty 'boiler scale' is formed in boilers, when hard water is used.
Answers
Explanation:
1.Solubility Curves find utility in separation and purification of solutes because, solubilities of unreacted starting materials, give by-products and side-products which lead to separation and purification of solutes
2.The reason for this gas solubility relationship with temperature is very similar to the reason that vapor pressure increases with temperature. Increased temperature causes an increase in kinetic energy. The higher kinetic energy causes more motion in molecules which break intermolecular bonds and escape from solution.
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3.Efflorescence Occurs : When The Vapour Pressure Of Hydrated Crystals Exceeds The Vapour Pressure Of The Atmospheric Humidity. Hence efflorescence is minimum during humid conditions
4.As the cold hard water enters the tubes,it is immediately changed into steam,while the dissolved solids incapable of changing into vapour get deposited on the inner walls of the tubes. this goes on and thus making the bore of the tubes narrower and narrower and crusty boiler scale is formed.