00:01
So why sea water will have a higher boiling point? just think about the collagative properties.
00:09
We know that if a solution has a higher molality, then the boiling point will be higher.
00:18
For b, when the pressure drops in a system, the solubility of a gas, so this is for gases, also goes down.
00:33
So that's why you open the bottle of soda, you see this gas is escaping to the atmosphere because the solubility got decreased.
00:47
Okay.
00:48
Now let's think molality and molarity.
00:52
One will be number of moles per mass in kilograms and the other one is number of moles per volume and liters.
01:04
And the thing is, water, pure water, and also for very diluted solutions, we know that one kilogram of water is very close to one liter of water.
01:20
So that's why for diluted solutions, the molality is close to the molarity.
01:31
Now, d, why do we prefer molality when we're dealing with changes in freezing point or boiling point? well, in this case, we're talking about temperature.
01:48
And the thing is, the molality, as we saw here, is defined with respect to the mass and not volume.
01:57
And volume changes with temperature...