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What is observed Colligative property?

Dilute solutions containing non volatile solute exhibits some special properties which depend only upon the number of solute particles present in the solution irrespective of their nature .The properties are called colligative properties .The colligative properties are – a) Lowering of vapour pressure.

Why do we get abnormal molecular masses from Colligative properties?

If a solute associates in the solution, the number of particles present in the solution will be less than the actual number dissolved and hence the value of osmotic pressure and other colligative properties will be smaller and consequently the molecular mass indicated will be higher than the true molecular mass.

Why is the mass determined by measuring a Colligative property in case of some solutes abnormal?

1 Answer. The compounds which dissociate or associate in the solvent show abnormal molecular masses. dissociate into ions which result in increased number of particles, hence higher value of colligative property. To account for association or dissociation van’t Hoff introduced a factor i known as van’t Hoff factor.

Which of the following has highest freezing point?

glucose solution

Which Colligative property is preferred for molar mass determination of macromolecules?

Osmotic pressure measurement

Which Colligative property is best?

Why is osmotic pressure the best colligative property? [closed]

  • Molarity is used instead of molality.
  • It’s magnitude is large even for dilute solutions.

Why is osmotic pressure preferred?

It is preferred for the macromolecules like proteins as they are unstable at high temperature and polymers have poor solubility. Also, due to their high molecular mass, the only colligative property which has a measurable magnitude is osmotic pressure. Therefore, osmotic pressure method is preferred.

Which Colligative property is best for molecular mass?

Osmotic pressure

What is meant by abnormal molecular mass?

The molecular mass obtained with the help of colligative property sometimes is different from normal molecular mass, it is called abnormal molecular mass. When the solute particles undergo association, number of particles become less and molecular mass determined with the help of colligative property will be more.

Which of the four Colligative property is most often used for molecular mass determination Why?

Which of the four colligative properties, is most often used for molecular mass determination? Solution : Oxmotic pressure gives the largest colligative property change per mole of solute.

Which Colligative property is used for purification of water?

(If one applies a pressure greater than the osmotic pressure to the higher concentration solution, one can force solvent molecules from the concentrated solution to the dilute solution, or pure solvent. This process, known as reverse osmosis, is often used to purify water.)

What is meant by elevation in boiling point Why is it a Colligative property?

The boiling point of a solvent will increase when a solute is dissolved in it. The elevation of the boiling point is directly dependent on the amount of solute present in the solution, but it is not based on the identity of the solute, so it is considered a colligative property.

What are some practical applications of boiling point elevation?

Uses of the Boiling Point Elevation

  • Antifreeze. Ethylene glycol or antifreeze helps prevent the water in your vehicle’s radiator from freezing through freezing-point depression.
  • Cooking.
  • Measurement of Molar Mass.
  • Sugar Refining.

How does elevation affect boiling point?

At increasing altitude, atmospheric pressure declines. At a higher elevation, the lower atmospheric pressure means heated water reaches its boiling point more quickly—i.e., at a lower temperature. Water at sea level boils at 212 degrees Fahrenheit; at 5,000 feet above sea level, the boiling point is 203 degrees F.