What is the purpose of the freezing point depression lab?

Purpose. To predict and measure the freezing point depression caused by a solute in a solvent.

How will you explain the result using freezing point depression?

Freezing Point Depression. The freezing point of a solution is less than the freezing point of the pure solvent. This means that a solution must be cooled to a lower temperature than the pure solvent in order for freezing to occur.

What is the major source of error in this experiment freezing point depression?

To use colligative properties, FDP, to determine the molar mass of an unknown. what were major sources of error in this experiment? naphthalene being lost because it solidified, not reading thermometer correctly, not letting all of solidified naphthalene melt before measuring FDP.

How does mass affect freezing point?

Thus, as the molar mass increases, the freezing point depression decreases. That is, increasing the molar (or molecular) mass will have a smaller effect on the freezing point.

How is molar mass related to the depression in freezing point of a solution?

` Molar mass of solute (m) and depression in freezing point `(Delta”T”_(“f”))` are inversely related.

How do we apply the concept of freezing point lowering in our day to day life activities?

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.

Is freezing point depression positive or negative?

This phenomenon is called freezing point depression. The change in the freezing point is defined as: ∆Tf = Tf,solution − Tf,solvent. ∆Tf is negative because the temperature of the solution is lower than that of the pure solvent.

How do you determine freezing point experimentally?

In order to determine the freezing point of this pure solvent you must first heat it in a test tube to over 60 °C using a hot water bath, and then measure the temperature as a function of time as the liquid cools. At first the temperature will fall quite rapidly.

How do Colligative properties affect freezing point?

Two examples of colligative properties are boiling point and freezing point: due to the addition of solutes, the boiling point tends to increase, and freezing point tends to decrease.

What freezing point means?

Medical Definition of freezing point : the temperature at which a liquid solidifies specifically : the temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure : melting point the freezing point of water is 0° Celsius or 32° Fahrenheit.

How do intermolecular forces affect freezing point depression?

So the freezing point will be high if the intermolecular forces are high as they would be freezing at high temperature as the attraction between the forces is strong. And if the intermolecular forces are less than their freezing point will be less.