00:01
Okay, so here we know that 0 .12 grams of the compound dissolves in 10 milliliters of acetone at 25 degrees c, and 0 .85 grams of the compound y dissolves in 10 millimeters of acetone at its boiling point.
00:20
And so we want to know what volume of acetone would be required to purify a 5 gram sample.
00:25
So if we think about how something could be purified by dissolving in something, like boiling acetone, we can think of recrystallization.
00:35
Because with recrystallization, you want something that's moderately soluble in something at room temperature, like this, but extremely soluble in something when it's boiling, like this.
00:48
So that way, when you cool it down, it will precipitate out of the solution and form purified crystals of whatever the compound is.
00:57
So that's why acetone is good here.
00:59
Now to figure out how much acetone you would need to purify compound y, we don't want to use, we don't want to use too much of the compound.
01:16
Sorry, we don't want to use too much volume of acetone because otherwise it won't end up precipitating out.
01:23
So we can see here that just by changing the temperature difference, we dissolve a great bit more.
01:27
And so we want to take the maximum amount that can be dissolved in something at at its boiling point...