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What is the freezing point constant?

Joe Ford

What is the freezing point constant?

Kf is the molal freezing point depression constant of the solvent (1.86 °C/m for water). m = molality = moles of solute per kilogram of solvent.

How do you find the freezing point constant?

The freezing point depression ∆T = KF·m where KF is the molal freezing point depression constant and m is the molality of the solute. Rearrangement gives: mol solute = (m) x (kg solvent) where kg of solvent is the mass of the solvent (lauric acid) in the mixture. This gives the moles of the solute.

What factors affect freezing point?

Factors That Affect the Freezing Point

  • Types of molecules: The types of molecules that constitute a liquid affect its freezing point.
  • On the other hand, if the intermolecular forces of attraction between molecules of the liquid are weak, then the freezing point becomes low.

What is an example of freezing point?

A very common example of this phenomenon in everyday life is salting of the roads in water. Pure water freezes at 0°C. However, by mixing in salt the freezing point of this mixture of water and salt will drop well below zero. This is why salt is used to keep roads free from ice.

What is a low freezing point?

When Molecules Freeze The forces between water molecules are considerably weaker; water freezes at zero degrees C (32 degrees F). Solvent mixtures and pressure variations reduce the forces between molecules, lowering the freezing point of liquids.

What is a gas turning into a solid called?

Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.

What is a gas turning into a liquid called?

At a certain temperature, the particles in a liquid have enough energy to become a gas. The process of a liquid becoming a gas is called boiling (or vapourization), while the process of a gas becoming a liquid is called condensation.

Can a gas turn into a liquid?

When a gas changes into a liquid, it is called condensation. When a liquid changes into a solid, it is called solidification. When a gas changes into a solid, it is called deposition . When a liquid changes into gas, it is called evaporation.