00:01
The concept involved here is elevation in boiling point and it says that suppose we have a pure volatile solvent then it will have a certain boiling point.
00:11
Now suppose we add a non -volatile solute to this pure solvent so we get a solution.
00:20
So now this solution will also have a certain boiling point.
00:26
Now, the concept says that the boiling point of the solution will be high as comparison to the boiling point of the solvent.
00:37
So that is there is increase in the boiling point of solution in comparison to the boiling point of the pure solvent.
00:46
So this increase in the boiling point.
00:48
This is called the elevation in boiling point.
00:51
So now mathematically it can be represented as delta tb.
00:56
So this is the elevation in boiling point, which will be directly proportional to the molality of the solution.
01:03
Now, molality is what? it is the method to determine the concentration of solution.
01:08
And molality can be defined as the number of moles of solute dissolved in one kilogram of the solvent.
01:17
So now if i remove this proportional design, so this will be delta tb is equal to kb.
01:26
So here kb is the molal elevation constant.
01:32
This is solvent specific.
01:35
So the kb values changes from solvent to solvent.
01:41
Now we can further elaborate the formula.
01:46
Since we know that the delta tb since it is equal to t b minus t b not.
01:56
This is what we are saying.
01:57
That the pure solvent boiling point is low and the solution boiling point is high so that's why we can subtract the solvent boiling point from the solution boiling point and this will be equal to kb and now multiplying the molarity can be further written as the number of moles of the solute dissolved in mass of the solute of the solute and and it should be in kilogram.
02:30
If it is not in kilogram then we have to convert.
02:34
Okay, so now the problem here is we have here the volume of water.
02:41
We don't have given the mass for water.
02:45
Right, water is the solvent here, but we don't have given the mass for solvent.
02:51
So, first of all, we have to find that.
02:54
Now, we know that there is a relation to that there is a relation to the solvent...