00:02
Hi there.
00:03
The vantah factor is important when we're working with colligative properties because the vantahoff factor tells us the number of particles a substance will break into when it is dissolved.
00:22
So the vantah factor is defined as the number of particles a substance forms in water.
00:41
So we'll say breaks into.
00:51
Okay.
00:52
So the vantah factor for molecules molecules, when placed into water, do not dissociate.
01:02
They don't break apart.
01:03
So for molecules, the vantaf factor is typically given the letter little i.
01:09
So for molecules, i is going to be equal to one.
01:14
Because if you put one molecule into water, you get one molecule.
01:18
For ionic compounds, it will be the number i is going to equal the number of cations formed.
01:31
Plus the number of anions, because an ionic compound will dissociate into cations and anions when you put it into water.
01:42
Okay, so let's look at each of these in turn.
01:45
First we have ch4, methane.
01:48
It is a molecular substance.
01:51
Carbon and hydrogen are both non -metals, so it's molecular.
01:54
So we know its vantaf factor is simply going to be one, because ch4 will not break apart in water.
02:01
So if we put one ch4 molecule in water, will have one molecule dissolved in water.
02:07
Next we have alcl3.
02:13
And i find it best to name these.
02:15
So alcl3 is aluminum chloride.
02:18
So aluminum is the cation.
02:20
Chloride is the anion.
02:22
So then i can ask myself how many aluminum ions there are here.
02:26
Well, the formula shows me that there's one aluminum and then how many chlorides? the formula shows me there are three of those.
02:34
So that gives us a total of four.
02:38
So the vantahaw factor for this substance is going to be four.
02:42
When we put aluminum chloride into water, it's going to break into three particles, one aluminum and three chlorides.
02:51
Next we have l .i .2 -so -4...