Class XII Chemistry Important Formulae PDF

Class XII Chemistry Ch. 2: Solutions Important formulae & Concepts 1. Mass percentage of a component (w/w) Mass of component in solution = × 100...

Class XII Chemistry Ch. 2: Solutions Important formulae & Concepts 1. Mass percentage of a component (w/w) Mass of component in solution = × 100 Toal mass of solution Volume percentage of a component (v/v) 2. Volume of the component = × 100 Total volume of solution Number of moles of the component 3. Mole fraction of a component (x) = Total number of moles of all components Number of parts of component 4. Parts per million = × 106 Total number of parts of all components of solution Number of moles of solute 5. Molarity = Volume of solution in litres Number of moles of solute 6. Molality = Mass of solvent in kilograms Number of gram equivalent of solute 7. Normality = Volume of solution in litres p1o − p1 8. = x2 p1o 9. ∆ T = Tb − Tb0 Kb × 1000 × w2 ∆Tb = M2×w1 10. ∆ T = Tf 0 − Tf K f × 1000 × w2 ∆Tf = M2×w1 Get the Power of Visual Impact on your side Log on to www.topperlearning.com  11.π = CRT w RT 12. M2= 2 πV 13. Normal molar mass i= Abnormal molar mass Observedcolligative property = Calculatedcolligative property Totalnumber of moles of particles after association/dissociation = Totalnumber of moles of particles before association/dissociation 14. Inclusion of van’t Hoff factor modified the equations for colligative properties as: p1o − p1 n o = i. 2 p1 n1 Kb × 1000 × w2 ∆Tb = i. M2×w1 K f × 1000 × w2 ∆Tf = i. M2×w1 n2RT π = i. V 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. p1 = po1 x1 ; p2 = po2 x2 Using Dalton’s law of partial pressures the total pressure of solution is calculated. ptotal=p1o +(p2o -p1o ) x2 Get the Power of Visual Impact on your side Log on to www.topperlearning.com