00:03
Hi there.
00:04
What we have here is a dilution problem.
00:09
What a dilution problem means is we are starting with the solution of a certain concentration, and then we add more solvent to that to reduce the concentration, to make it less concentrated.
00:22
So that is a dilution.
00:24
And the equation that we use for a dilution problem is m1 times v1 equals m2 times v2, where m is molarity and v is volume.
00:38
The ones represent the concentrated solution, and the twos represent the diluted solution, or the less concentrated solution.
00:47
The reason this works is because molarity times volume gives you number of moles, and the total number of moles in the two solutions are going to be the same, but the second solution has a greater volume, so therefore it's less concentrated.
01:03
Okay, so let's look at putting some numbers in here.
01:07
The concentrated solution is 12 molar.
01:14
And we are using 10 milliliters of that.
01:22
And we want to know the new concentration when we add enough water to that to give us a total volume of 250 milliliters.
01:35
Okay, so this is our equation.
01:37
We want to solve for m2...