00:02
Hi there and welcome.
00:05
In this question, we are trying to make a certain amount of a molar solution.
00:10
The first thing i want to do, therefore, is to define molarity.
00:14
Malarity is defined as moles of solute per liter of solution.
00:27
Therefore, since we are trying to make a 2 .00 molar solution, that means we want 2 .00 moles of k -o -h in every liter of, of the solution.
00:44
We are also given the formula mass, which would be the same as the molar mass for k -o -h.
00:49
That tells us that one mole of k -o -h has a mass of 56 .0 grams.
00:59
All right, so this is just information from the problem.
01:03
And we want to know how many grams of the k -o -h we need to prepare 250 milliliters of the solution.
01:11
So that's what i want to start with, is the 250 mil -land -50 mil -land -fewater.
01:14
We notice that that only has two significant figures, so our answer will need to be in two significant figures.
01:22
The other two values we're using both have three.
01:25
Okay, so we're trying to make 250 milliliters of solution.
01:30
In order to use my first equality here as a conversion factor, i need liters.
01:37
So i'm going to convert this milliliters to liters.
01:40
And i can do that because i know there are 1 ,000 milliliters of anything in one liter...