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Re: Forensics C
Posted: January 13th, 2010, 3:59 pm
by kjhsscioly
this is a good site, right off the SO website. However, i cannot attest to the accuracy of the information, you may decide to actually do the tests on each chemical.
http://soinc.org/sites/default/files/up ... orQual.pdf
Re: Forensics C
Posted: January 14th, 2010, 5:52 pm
by jazzy009
That's from the Benevolent Lin. On the SciO board for Chemistry. She knows what she's doing
Re: Forensics C
Posted: January 14th, 2010, 6:49 pm
by kjhsscioly
I am not so sure. My partner tells me that some of the info is slightly off
Re: Forensics C
Posted: January 15th, 2010, 4:23 am
by jazzy009
kjhsscioly wrote:I am not so sure. My partner tells me that some of the info is slightly off
Which ones? I don't agree with some of the Benedict's reactions but that's just my preference for flow charting...
Re: Forensics C
Posted: January 15th, 2010, 6:13 pm
by kjhsscioly
the team did the tests last year... i am not sure which ones are wrong
Re: Forensics C
Posted: January 18th, 2010, 12:34 pm
by cyanoacrylateismybff
Can anyone recommend a good pH paper THAT ACTUALLY WORKS? All last year, ours never worked and it really cost us. If anyone can suggest, or post links of where to buy good pH paper, it would be much obliged!!
Re: Forensics C
Posted: January 19th, 2010, 5:49 pm
by zeebz -_-
what my team did was use the ph paper and only applied the water to certain points. like, we used toothpicks to get the water sample and place it on the paper. that way, the chemicals didn't mix together and you save paper.
Re: Forensics C
Posted: January 19th, 2010, 7:36 pm
by jazzy009
cyanoacrylateismybff wrote:Can anyone recommend a good pH paper THAT ACTUALLY WORKS? All last year, ours never worked and it really cost us. If anyone can suggest, or post links of where to buy good pH paper, it would be much obliged!!
http://www.connecticutvalleybiological. ... br1021.jpg
Essentially, that is what I use, I don't know where to get it because I got it from my coach. If your pH problems persist, work around them, as you should with all weaknesses (I try to work around flame tests whenever logically possible).
Re: Forensics C
Posted: January 20th, 2010, 4:28 pm
by pirate_capn38
I've also had issues with pH paper doing weird stuff during competition. It seems easier to just rely on different tests with the other reagents to ID the powders. pH isn't a great indicator for most things anyways, it will only set a couple of powders apart.
Re: Forensics C
Posted: February 7th, 2010, 4:27 pm
by Jest
My invitational was a test with all multiple choice with 3 simple math problems. Absolutely no lab stuff. Anybody else like that?
