Using Raoult’s law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions.

Monjur Alahi

Using Raoult’s law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions.

(i) CHCl3 (l) and CH2Cl2(l) 

(ii) NaCl(s) and H2O (l)


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Salim Ahmed Kawsar

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Hint : Discuss the following formulas 

(i) for a binary solution having both components as volatile liquids, the total pressure will be 

p = p1 = x1p10 + x2p20 

= x1p10 + (1–x1)p20 

= (p10 – p20 )x1 + p20 

p = total vapour pressure 

p1 = partial vapour pressure of component 1 

p2 = partial vapour pressure of component 2. 

(ii) For a solution containing non-volatile solute, the Raoult’s law is applicable only to vaporisable component (1) and total vapour pressure is written as 

p = p1 = x1p10

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