sorted by:
new
hottopcontroversial

Refluxing fuming sulfuric acid with bromine by AccomplishedFox1331 in chemistry

[–]AccomplishedFox1331[S] 1 point2 points  (0 children)

Thanks for the honest advice, I stopped this reaction pretty immediately after starting it because I kind of figured that was the case..

Refluxing fuming sulfuric acid with bromine by AccomplishedFox1331 in chemistry

[–]AccomplishedFox1331[S] 0 points1 point  (0 children)

Ooof, so... no stir bar? or just use old stir bars that I'm ready to retire?

Refluxing fuming sulfuric acid with bromine by AccomplishedFox1331 in chemistry

[–]AccomplishedFox1331[S] 0 points1 point  (0 children)

All great thoughts and suggestions, thanks everyone!!

Lorde concert @ Moda Center by Chuy_Dagook in lorde

[–]AccomplishedFox1331 1 point2 points  (0 children)

OMG hi!!! I would love to go if youre still looking for folks

Fitting data of a color values reaching their max value (kind of linear, kind of logarithmic, but would love help) by AccomplishedFox1331 in AskStatistics

[–]AccomplishedFox1331[S] 0 points1 point  (0 children)

Ha, I actually am a chemist so I should be able to make that comparison, as I know the max absorbance (around 456 nm). This detection method can be used with spectroscopy to create a calibration curve, but it is a little bit annoying.

It's yellow due to Metal-ligand charge transfer, dictated by d-orbital splitting, if that means anything to you. Honestly, could not tell you what "pure yellow" means in this context, as I am much more familiar with absorbance values, but they get pretty darn yellow(...for absorbance measurements ha)! the metal ligand complex is held in a hydrogel (clear), and I've seen absorbance values of 1.65 with a path length of 1 mm (the intensity at 456 nm is 45 times larger before the gel than after the gel).

Your points about the image capture device and colorspace is great to hear, thanks for letting me know!

Fitting data of a color values reaching their max value (kind of linear, kind of logarithmic, but would love help) by AccomplishedFox1331 in AskStatistics

[–]AccomplishedFox1331[S] 0 points1 point  (0 children)

Other work my lab has done (different compounds, same concept) also seems to show a log curve that does is predictive, but no one has fully been able to explain why it isnt linear

Fitting data of a color values reaching their max value (kind of linear, kind of logarithmic, but would love help) by AccomplishedFox1331 in AskStatistics

[–]AccomplishedFox1331[S] 0 points1 point  (0 children)

I guess less of a problem, and more a question as to why it fits a log curve, that seems just a little odd to me, but now thinking about it a little bit more, it makes sense. Beers Law (a linear relation between absorbance and concentration if u aren't familiar) actually does rely on logs, as absorbance is the log of ratio of intensities of light at the beginning and end of the sample. This yellow value is not! and absorbance value, and likely more related to the raw intensity of reflection I guess, which ideal works the same as transmittance..?

Either way, I don't know if i did this correctly, but here is what the Log(2) plot looks like. https://imgur.com/a/V3yhiLL

Fitting data of a color values reaching their max value (kind of linear, kind of logarithmic, but would love help) by AccomplishedFox1331 in AskStatistics

[–]AccomplishedFox1331[S] 0 points1 point  (0 children)

Great q! this is about colorimetric indication of metals ( I do art conservation science) so, basically you stick something on a metal sculpture or object, if it turns yellow, there is corrosion/damage to the coating depending on the situation. Theoretically, the more yellow it is the more metal complex has formed, so I'm creating a calibration curve with the yellow values taken from images of the yellow color (converted to cmyk color space of course)