Recent content by maysj18

Ohhhhhhhhhhhhhhhhhhhhh, so that green I saw means that all the chromium reacted and that it was not in excess. Right?! What about the blue? What do you think happened there? I definitely follow you on why one solution was green. It wasn't diluted hardly at all, so I bet that's why.

Cr 3+ and it should be yellow.

I understand that. But there was no KI even added to the solution at this point, so that doesn't explain why the dichromate layer was green/blue.

Well, it's a redox titration, not acid/base. If I said acid/base, that was my mistake. 2Cr2O7(2-) + 16H+ + 3C2H5OH --> 4Cr3+ + 11H2O + 3CH3COOH Cr2O7(2-) + 14H+ + 6I- --> 2Cr3+ + 3I2 + 7H2O 2S2O3(2-) + I2 --> S4O6(2-) + 2I This is the overall reaction that is supposed to take place. I just...

The acid chromate solution that the alcohol was suspended over top of was supposed to be a bright yellow after incubation. Instead, they were green or blue.

That's just the thing. It doesn't make any sense. All the literature I have talks nothing about this particular thing happening. I'm assuming that means it was just a fluke, but I really want to cover my bases.

Hi everyone! So, something sort of weird happened in analytical lab and I was wanting some guidance. I was trying to determine the ethanol concentration in a 4 Loko, a red wine, and a beer through acid/base titration. I pipetted a little bit of a diluted alcohol sample into a small beaker and...