[PDF] Class XII Chemistry Ch. 2: Solutions Important formulae & Concepts





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Chemistry Notes for class 12 Chapter 2 Solutions

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Class XII Chemistry Ch. 2: Solutions Important formulae & Concepts

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Class XII

Chemistry

Ch. 2: Solutions

Important formulae & Concepts

1. Mass percentage of a component (w/w)

Mass of component in solution100Toal mass of solution× 2.

Volume percentage of a component (v/v)

Volume of the component = 100Total volume of solution×

3. Mole fraction of a component (x) =

Number of moles of the component

Total number of moles of all components

4.

6Number of parts of componentParts per million10Total number of parts of all components of solution=×

5. Number of moles of soluteMolarityVolumeof solution in litres= 6. Number of moles of soluteMolalityMass of solvent in kilograms= 7. Number of gram equivalent of soluteNormalityVolumeof solution in litres= 8. o 1 1 2o 1 p pxp-= 9.

Δ = -0

b bT T T b 2b

2 1K 1000 wTM ×w× ×Δ =

10. 0 f fT T TΔ = - f 2f

2 1K 1000 wTM ×w× ×Δ =

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π = CRT

12.

22w RTM =Vπ

13.

Normal molar massiAbnormal molar mass

Observedcolligative property

Calculatedcolligative property

Totalnumberofmolesofparticlesafterassoci

ation/dissociation on/dissociation

14. Inclusion of van"t Hoff factor modified the equations for colligative

properties as: -=o 1 1 2 o11 n.n p pip

× ×Δ =b 2b

2 1K 1000 wT .M ×wi

× ×Δ =f 2f

2 1K 1000 wT .M ×wi

=π2n RT.Vi

15. According to Raoult"s law for a solution of volatile liquids the partial

vapour pressure of each component in the solution is directly proportional to its mole fraction. p

1 = po1 x1 ; p2 = po2 x2

Using Dalton"s law of partial pressures the total pressure of solution is calculated. o o o total 1 2 1 2p =p +(p -p )xquotesdbs_dbs17.pdfusesText_23
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