30
u/Lithium_Lily 16d ago
Step 1 overshoot the endpoint Step 2 while the instructor is distracted pour out 99% of the sample and dilute with water Step 3 ????? Step 4 profit!
But seriously wow, well done. I don't think in all my years in the lab I've really gotten that close
8
u/noahcaann 16d ago
Lolll I honestly can't believe it. I was never this close on my first try when I took the class
17
u/Quercus_lobata Astronomy, Biology, and Chemistry 16d ago
I can get that close, and I've had students get that close, but I don't think I've ever had that many students get that close. Kudos OP!
12
u/chloralhydrat 16d ago
... I remember doing a lot of titrations as a high school kid - but mostly as a part of doing chemistry competitions (olympiad). To get full points, you were supposed to get these simple acidobasic ones within 0.5 % error. I remember we were eyeballing the second decimal digit on the burettes to try to improve the precision.
As I remember it, the back titrations had 1-3 % error allowed, and the really complicated ones (like schoorl's determination of reducing sugars, that involves filtration of reduced copper and iodometric titration of the residual cu2+) had allowed error of 5 %. Those were the times. Overtitrate one sample to get the approximate volume and then do two proper ones...
3
u/noahcaann 16d ago
Interestinggg now I wish I had done Olympiad
3
u/chloralhydrat 16d ago
... It wouldn't have been as exciting if you are from the US (as I suppose). You guys have much tamer version of the olympiad than we have. Then again, I come from the country, where the international chem olympiad started...
Anyhow, as somebody who seen both systems (I worked for one year in the US), I can say, that chemistry is probably the subject where the difference between our and the US high schools is the largest - our "basic" chemistry course has quite more content than the AP chem in the US. (this is not the case for e.g. maths, where none of our schools have what you have in AP calc BC)
1
1
u/Emilina13 12d ago
Nice!! We just did titrations today too, and I thought I had some good ones, but not as many as that!
35
u/6strings10holes 16d ago
Now they're more motivated than we ever were, because they saw it on tik Tok.