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Solutions — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySolutions3 Marks
Question
Using Raoult’s law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions.
CHCl3(l) and CH2Cl2(l)
✓

Answer

For a binary solution having both components as volatile liquids (viz. CHCl3 and CH2Cl2), the total pressure will be
$\text{p}=\text{p}_1=\text{x}_1\text{p}^0_1+\text{x}_2\text{p}^0_2$
$=\text{x}_1\text{p}^0_1+(1-\text{x}_1)\text{p}^0_2$
$=(\text{p}^0_1-\text{p}^0_1)\text{x}_1+\text{p}^0_2$
p = total vapour pressure of the given mixture/ binary solution of the given volatile liquids
p1 = partial vapour pressure of component 1 (i.e. CHCl3)
p2 = partial vapour pressure of component 2 (i.e. CH2 Cl2)

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