00:01
The concept involved here is depression in freezing point.
00:02
It says that suppose we have a pure volatile solvent.
00:05
So it will have a certain freezing point.
00:08
Now suppose we add a non -volatile solute to this pure solvent.
00:12
So when we add solute to solvent, we get a solution.
00:15
Okay.
00:16
So now we have a solution and for this solution also we will have a certain freezing point.
00:21
Now the basic concept involved here is that there will be decrease in the freezing point of the solution formed.
00:30
As comparison to the pure volatile solvent.
00:34
This decrease in freezing point, it is called the depression in freezing point.
00:38
And now mathematically it can be written as delta tf that is directly proportional to molality of solution.
00:47
So, delta tf, this symbolizes the depression in freezing point or it can be written as delta tf is equals to kfm.
01:00
So, kf is the molar depression constant.
01:04
This molar depression constant here is solvent specific.
01:08
It changes from solvent to solvent...