00:03
First one, calculate the mass of the copper sulfate and five water.
00:14
So i think you'll mention this, right? copper sulfate with five water to make 25 mililiters of 0 .35 more copper sulfate here.
00:26
So first, we can calculate the more of the copper sulfate that is knitted.
00:31
That's equal to the concentration times of volume.
00:35
So that's 0 .3x times 25 over 1 ,000.
00:43
That's equal to 8 .75 times 10 to minus 3 more.
00:55
So the mass of the copper sulfates with 5 water should be more times more mass.
01:05
That's equal to 8 .75 times 10 to minus 3 times more mass times more mass is let's do the calculation, copper 63 .5 plus sulfate 96 plus 5 water, 90.
01:26
So totally, let's do the calculation, that's equal to, so that's about 2 .183 grams.
02:04
And question two, why is necessary to be careful in making up the standard solutions? because you need very precise concentration so that when you use that to do the titration, you can get accurate value.
02:22
That basically is you need high accuracy.
02:28
You need high accuracy of the concentration...