ELEVATION IN BOILING POINT // colligative property.

[00:00:00]Hello students, welcome to my YouTube channel and uh today's topic is elevation in boiling point. This is also a type of collleative property. So first of all I'm writing elevation in boiling point in sort EBP.

[00:00:27]So before that we should know what is boiling point.

[00:00:33]Boiling point is the temperature at which atmospheric pressure is equal to vapor pressure. So atmospheric pressure is equal to vapor pressure that is the temperature and that temperature is known as boiling point.

[00:01:11]So boiling point is different for different uh solvents or solutes. So let us take why it is a collleative property. Why elevation in boiling point is a collleative property. Let us take a beaker beaker.

[00:01:31]only of pure solvent layer.

[00:01:36]Suppose the pure solvents are present in this beaker and you applied heat then its boiling point you'll note its boiling point. Suppose the boiling point of this pure solvent is 60°.

[00:02:01]Then you add few solute particles in that beaker.

[00:02:14]Solute particle solution preparation.

[00:02:23]After solution is prepared now you can note it down definitely the boiling point is more than the pure solvent.

[00:02:35]So here the boiling point is elevated pure boiling point if you make a difference then definitely the difference is 40° it's a hypothetical pure solvent solution boiling point after addition of solute particles. So that phenomenon is known as elevation in boiling point.

[00:03:08]Understood?

[00:03:12]Suppose suppose I will take uh TB TB. This is boiling point of solution and t is boiling point of pure solute.

[00:03:51]three pure solvent.

[00:03:57]So what will be the difference? Delta TB is the difference means boiling point of solution minus boiling point of pure solvent that is TB minus T B. And what is delta TB? This delta TB is known as E BT elevation in boiling point. So E DP that is elevation in boiling point.

[00:04:32]So delta TB is TB minus T B. And this elevation in boiling point why it is a collleative property collleative property because delta TB is directly proportional to concentration.

[00:04:48]Suppose I will take here mity as the concentration. Delta TB is directly proportional to mality. So it is independent of nature and depends on the concentration of solution or solute particles or solvent particles to basically concentration of solute particles that's why it is a collleative property.

[00:05:14]So let us take a graph here in x-axis I will take temperature that is in kelvin and here vapor pressure in one atmospheric pressure 1 atm.

[00:05:32]Suppose this is the point at which the it is a boiling point of pure solvent and this point is a boiling point of solution. This one is pure solvent and this one is solution. So definitely as in x-axis gradually the temperature goes on increasing.

[00:06:04]So this point is known as t b and this point is known as tb. So this difference is known as delta TB boiling point solution boiling point solvent pure solvent boiling point difference this delta TB B is elevation in boiling point which is directly proportional to mality.

[00:06:48]We can write delta TB is equal to proportity.

[00:06:56]What is KB? KB is known as EO scopic constant or you also can write mal elevation constant.

[00:07:17]So in place of mality we can write delta TB is equal to KB marity formula 1,000 beta Washington WB by MB multiple,000 multiple WA. So this is the formula for elevation in boiling point. And why it is a collleative property? Once again I repeat why it is a collleative property.

[00:07:48]Because elevation in boiling point depends on mality. Mality is a concentration. It depends on concentration. It depends on amount of substances and independent of any nature of solute or solvent. So that's why elevation in boiling point is a collleative property and from this graph it is clearly this graph explaining that solution has higher boiling point than the pure solvent and that difference is delta TB and it is a collleative property. So in this way we completed collleative second collleative property that is elevation in boiling point in sort EBP. In our next video we shall start BFP defraation in freezing point. Till then uh please like, share and subscribe my YouTube channel and also spread among your friends so that your friends will be helpful. Thank you students.