00:01
Okay, so we're asked to find the blood alcohol content of this subject being tested and gives us, and we're using potassium chromate to figure this out.
00:12
And so we're titrating in this blood to find ethanol content within it using potassium chromate in this really long reaction that you can tell you ran out space to fit.
00:25
What really matters is the ratio here between the amount of in the amount of ethanol.
00:32
And we won't use that immediately, but it will come up.
00:35
The rest of it is this kind of nice to know, but not necessary to the question.
00:39
And so the thing is, this is going to behave like any other titration, whether it be in space or anything like that, where chromate reacts with ethanol to neutralize it.
00:50
So if you know how much chromate you put in, you can find out how much ethanol is in this solution.
00:54
So let's convert the amount of chromate we put in into a mole concentration that we can actually use.
00:59
So first thing is molarity is in moles per liter.
01:04
So let's go ahead convert this into liters.
01:06
So 25 .6 mililiters divide by 1 ,000 to convert to liters.
01:14
Then we have 0 .0256 liters of ethanol.
01:20
Next we can take our 0 .05 moles per liter, molarity, times the liter is here.
01:28
0 .0256 liters and we'll get 0 .0 .0.
01:40
This is not ethanol.
01:41
This is potassium chromate...