SOLID-VAPOUR EQUILIBRIUM: We can explain this by the example of sublimation of Iodine. If we place solid iodine in a closed vessel, after sometime the vessel gets filled up with violet vapours and the intensity of color increases with time. After certain time the intensity of color becomes constant and at this stage equilibrium is attained. Hence solid iodine sublimes to give iodine vapours and iodine vapours condenses to give solid iodine. This equilibrium can be represented as I2 solid ⇌ I2 vapour Other examples are Camphor solid ⇌ Camphor vapour NH4Cl solid ⇌ NH4Cl vapour Equilibrium involving Dissolution of solids in liquids:In saturated solutions, a dynamic equilibrium exists between solute molecules and the solution.

For example sugar solution ⇌ sugar solid and the rate of dissolution of sugar = rate of crystallization of sugar. Equilibrium involving dissolution of gases in liquids. In a soda water, the equilibrium is CO2 gas ⇌ CO2 (in solution) According to Henry’s law, the mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to pressure of the gas above the solvent. Hence when a soda water bottle is opened, some of the CO2 gas dissolved in it escapes out rapidly to reach a new equilibrium state required for the lower pressure.

ที่มา : http://www.7active.in

ลิงค์ : http://youtu.be/ss2ZC3gpeA8

อัพโหลดโดย : 7activestudio