Colligative Properties Formulae

Colligative Properties Formulae
Colligative Properties Formulae

Expression for the Concentration of Solution

Normality: The normality of the solution is defined as the number of gram equivalent of solute dissolved in 1 litre of the solution.

Molarity: The molarity of the solution is defined as the number of moles of solute per litre of the solution.

Formality: The formality of the solution is defined as the number of formula weight of the solute dissolved in 1 litre of the solution. It is used to express the concentration of ionic substances.

Molality: It is defined as the number of moles of solute dissolved in 1 Kg of the solvent.

Mole Fraction: The ration of the number of moles of the component to the total number of the moles of all components (solute and solvent) present in the solution.

Let us consider a solution containing n moles of solute and N moles of solvent

Gram per litre:  It is defined as the amount of solute in gram present in 1 litre of the solution.

Percentage by Weight (% as w/w): It is defined as the weight of the solute in gram present in 100 gm of the solution.

Percentage by Volume (% as w/v): It is defined as the weight of solute in gram present per 100 ml of the solution.

Formulas of Lowering of Vapour Pressure

P = Vapour Pressure of Pure Liquid

Ps = Vapour Pressure of the solution

M = Molecular Weight of solvent

m = Molecular Weight of solute

w = weight of solute

W = weight of solvent

Formulas of Elevation of Boiling Point

T = Boiling Point of Solution

To = Boiling Point of Solvent

Kb = Molal Elevation constant

Cm = Molality of the solute

Hv = Latent heat of vaporization

Formulas of Depression of Freezing Point

T = freezing point of the solution

To = Freezing point of the solvent

Kf = molal depression constant

Hf = Latent Heat of fusion

Formulas for Osmotic Pressure

Formulas for Van’t Hoff Factor

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Jyoti Bashyal

Jyoti Bashyal, a graduate of the Central Department of Chemistry, is an avid explorer of the molecular realm. Fueled by her fascination with chemical reactions and natural compounds, she navigates her field's complexities with precision and passion. Outside the lab, Jyoti is dedicated to making science accessible to all. She aspires to deepen audiences' understanding of the wonders of various scientific subjects and their impact on the world by sharing them with a wide range of readers through her writing.

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