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Chemistry – Class XII – Formulae & Solutions – Depression in Freezing Point, Dissociation of Solute, Osmotic Pressure, Relative Lowering of Vapour Pressure, Elevation of Boiling Point, Van’t Hoff Factor, Association of Solute & Henry’s law – Very Useful f $2.99
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Chemistry – Class XII – Formulae & Solutions – Depression in Freezing Point, Dissociation of Solute, Osmotic Pressure, Relative Lowering of Vapour Pressure, Elevation of Boiling Point, Van’t Hoff Factor, Association of Solute & Henry’s law – Very Useful f
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Chemistry – Class XII – Formulae & Solutions – Depression in Freezing Point, Dissociation of Solute, Osmotic Pressure, Relative Lowering of Vapour Pressure, Elevation of Boiling Point, Van’t Hoff Factor, Association of Solute & Henry’s law – Very Useful for Students studying in Class XI...

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  • August 22, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
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  • chemistry
  • class12
  • class11
  • xii
  • formulae
  • solutions
  • formulaesolutions
  • questions
  • neet
  • jee
  • xi
  • 11
  • 12

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➢ Depression in freezing point
Solutions 1


Tf = K f
m
RT20 RT2M
Kf = = A0

1000Ifusion 1000Hfusion

➢ Dissociation of solute

(A) n →
nA
1+ (n −1)
i= ( = degree of dissocition)
1




JI
PAo X A + PBo X B 
➢ P =
sol
0
Raoult’s law
(PB − PA )X B + PA
o o


➢ Osmotic pressure

 = CRT
LA
For isotonic solution, 1 = 2

1 YA YB
➢ = +
Psol PAo PNo

➢ Relative lowering of vapour pressure

PAo − P
= ( B = mole fraction of solute)
A
B
PAo

PA B PB
➢ YA = ;Y =
PA PT
B

Where YA and YB are mole fraction in vapour phase and P A = PAo X A : PB = PBo X B

➢ Elevation of boiling point

Tb = K b
m
RT20 RT2M
Kb = = A0

100I vapour 1000H vapour

Where, m = molality

MA = molecular mass of
solvent

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