For my aspirin coursework, I did some colorimetry, and to do that I needed to create a calibration curve for different cncentrations of salicylic acid. The salicylic acid was purple because I complexed it with iron (III) Chloride. The concentrations I used were 0, 0.1, 0.2, 0.3, etc up to 1 mol dm3.
However, ater doing this, I got a sort of s shaped calibration curve... Can anyone tell me whether that's the sort of thing I SHOULD be seeing of not? I'm a little unsure because, especially for the higher concentrations, precipitate formed when diluting, so the readings aren't very accurate... plus I don't really trust the colorimeter XD
If I shouldn't be seeing an s shaped curve, what kind of thing should I be seeing? I tried looking on the internet but I can't seem to find anything on what it should look like...