00:01
Recognizing the stoichiometry between copper 2 plus and the thiosulfate is 1 to 1, then we can calculate the mass weight, the mass percent of copper by first calculating the mass of copper.
00:17
To do that we'll start with the volume of the thiosulfate required to reach the equivalence point, that was 14 milliliters.
00:35
We'll convert those milliliters into liters by dividing by a thousand and then we'll convert the liters into moles using the molarity.
00:48
The molarity was one liter is 0 .1016 molar, moles per liter.
00:58
Now we don't need to adjust this volume 14 milliliters because the blank titration was zero milliliters.
01:05
After we have moles thiosulfate, knowing the stoichiometry is 1 to 1, we convert the moles thiosulfate into moles of the copper 2 plus.
01:20
Then we go from moles copper 2 plus to grams copper 2 plus, which will be the, um, we will do this using the molar mass of copper.
01:33
One mole copper 2 plus has the same mass as one mole copper itself...