00:01
A solution with potassium permanganate of a non -concentration is diluted by pipetting 20 milliliter of the solution into a beaker with 100 milliliter of water.
00:15
Now in a spectrophotometer the diluted solution had a absorbance of 0 .325.
00:23
So several solution of potassium permanganates of different concentration were prepared for calibration and present in a diagram.
00:33
So calculate the concentration of this unknown solution using diagram.
00:37
So very first thing you can tell that the graph that you see is a standard curve between the concentration of permanganate and absorbance.
00:49
So we get an idea that the standard curve has a equation of y equals 0 .0422 x, 442 x actually.
01:18
So this actually is the correlation between the concentration and absorbance.
01:24
So all the potassium permanganate follow this same standard curve.
01:30
We know that x is always the concentration, y is always the absorbance.
01:37
So we have used the non -concentration of potassium permanganate to derive this standard curve.
01:46
Now we have a unknown solution but we know the absorbance.
01:50
All we have to do is we plug our absorbance into y and then we solve for x.
01:56
X will be the concentration of the unknown potassium permanganate solution.
02:03
The keyword here is to remember all the potassium permanganate follow the same standard curve.
02:10
Now in this case we know that our concentration is, or the absorbance is 0 .325.
02:18
So that equals y and then 0 .0442 x.
02:26
So we calculate x equals 0 .325 divided by 0 .0442.
02:36
So you get 7 .35...