Forensics C

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cyanoacrylateismybff
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Re: Forensics C

Post 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!!
SciOly Events '10
Anatomy+Physiology
Forensics (2nd regionals last year)
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Re: Forensics C

Post 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. :D
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Re: Forensics C

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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).
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Re: Forensics C

Post 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.
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Re: Forensics C

Post by Jest »

My invitational was a test with all multiple choice with 3 simple math problems. Absolutely no lab stuff. Anybody else like that?
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Re: Forensics C

Post by monkeysareawesome »

have any of you any had ballistics on a test, and if you have what did they ask you/what did you need to know to answer the questions??
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Re: Forensics C

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Jest wrote:My invitational was a test with all multiple choice with 3 simple math problems. Absolutely no lab stuff. Anybody else like that?
At least 20% of the test (50% here) is based on labs, they just didn't include powders?
That's taking out the best aspect of the event...
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Re: Forensics C

Post by Jest »

jazzy009 wrote:
Jest wrote:My invitational was a test with all multiple choice with 3 simple math problems. Absolutely no lab stuff. Anybody else like that?
At least 20% of the test (50% here) is based on labs, they just didn't include powders?
That's taking out the best aspect of the event...
We didn't have anything to identify(sodium acetate, sodium chloride, sodium hydrogen), no water testing, no chromatography, and no analysis of crime. They even told us we didn't need lab coats or safety goggles. Just a plain old multiple choice with 58 or so questions.
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Re: Forensics C

Post by jazzy009 »

Jest wrote: We didn't have anything to identify(sodium acetate, sodium chloride, sodium hydrogen), no water testing, no chromatography, and no analysis of crime. They even told us we didn't need lab coats or safety goggles. Just a plain old multiple choice with 58 or so questions.
If you're new to the event don't expect that to be the norm for the rest of the year. I guess I can understand a shortage of some things but to not have ANY of the main components of this event...ends up being a waste of time for those who practiced and got their powders/chromatography down.

On a side note, anyone ever gotten mass spectroscopy instead of chromatograms? Or know of a test online that has questions? I haven't checked yet.
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Re: Forensics C

Post by pirate_capn38 »

monkeysareawesome wrote:have any of you any had ballistics on a test, and if you have what did they ask you/what did you need to know to answer the questions??
Generally there isn't much on ballistics... even if there is, anything I've ever seen is mostly matching. It's good to know the basics (rifling), but beyond that, it doesn't really ever compose a large part of the test.
jazzy009 wrote:
On a side note, anyone ever gotten mass spectroscopy instead of chromatograms? Or know of a test online that has questions? I haven't checked yet.
I've seen some mass spec, but it's also largely matching again. Some theory on how it works, too. Sadly, any more than that is really up for grabs for anyone...

Has anyone seen any good water qual this year? In Texas, the invitationals tend not to give us too much, so I'm not sure what to expect. Once again, a plea for information on a good conductivity tester? What do y'all use? Thanks. :)
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