Actorsaffecring abnormql molar mass of solite
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●Abnormal Molar Mass:
Molecular masses of the solute can be easily determined with the help of colligative properties; relative lowering in vapour pressure, boiling point elevation, freezing point depression, and osmotic pressure easily. But, we derived the relation between the molecular mass of solute and colligative properties under some assumptions, which are:
The solution is diluted that is, solvent is available in large amount in order to obey Raoult’s Law
The solute neither went dissociation or association in the solution
So, how do we determine the molecular mass of solute in case the above assumptions are not valid? Basically, the abnormality is due to:
●Association of Solute Particles
●Dissociation of Solute Particles
Association of Solute Particles:
Some solute molecules start to associate inside the solution. This means now there are less number of solute particles in the solution. As colligative properties vary with solute particles in the solution, they will decrease along with the solute particles. As colligative properties are inversely proportional to the molecular mass of solute, we get a higher molar mass of the solute. For Example, ethanoic acid or acetic acid ( CH3COOH) associate in solution to form a dimer due to hydrogen bonding.
Dissociation of Solute Particles:
Some solute molecules, generally electrolytes dissociate into two or more ions/particles when dissolved in a solution. This leads to increase in solute particles in the solution, thereby increase in colligative properties of solutions. As colligative properties and molecular mass of solute varies inversely, we get a lower molar mass of the solute.
●Abnormal Molar Mass:
Molecular masses of the solute can be easily determined with the help of colligative properties; relative lowering in vapour pressure, boiling point elevation, freezing point depression, and osmotic pressure easily. But, we derived the relation between the molecular mass of solute and colligative properties under some assumptions, which are:
The solution is diluted that is, solvent is available in large amount in order to obey Raoult’s Law
The solute neither went dissociation or association in the solution
So, how do we determine the molecular mass of solute in case the above assumptions are not valid? Basically, the abnormality is due to:
●Association of Solute Particles
●Dissociation of Solute Particles
Association of Solute Particles:
Some solute molecules start to associate inside the solution. This means now there are less number of solute particles in the solution. As colligative properties vary with solute particles in the solution, they will decrease along with the solute particles. As colligative properties are inversely proportional to the molecular mass of solute, we get a higher molar mass of the solute. For Example, ethanoic acid or acetic acid ( CH3COOH) associate in solution to form a dimer due to hydrogen bonding.
Dissociation of Solute Particles:
Some solute molecules, generally electrolytes dissociate into two or more ions/particles when dissolved in a solution. This leads to increase in solute particles in the solution, thereby increase in colligative properties of solutions. As colligative properties and molecular mass of solute varies inversely, we get a lower molar mass of the solute.
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