Forensics C
- pikachu4919
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Re: Forensics C
Yes, they should. Candles and matches are not too hard to come by nowadays. Again, tho, that is also dependent on the event supervisor. And, as with hairs, if they're difficult to come by, they will use microscope images as a substitute (a poor substitute, really, but in all honesty, feasibility of obtaining that stuff may not necessarily be in the event supervisor's control either).Stefannli wrote:Do invitational competitions like Princeton require competitors to identify fibers from actual burn tests?
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
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Re: Forensics C
Hi Guys,
I'm new to forensics this year, but I've been trying to find the best and most time efficient method for the qualitative analysis. There are just 4 powders that seem to have the same results for all of the tests we are given. The powders I've been having a problem differentiating are Sodium Acetate, Sodium Chloride, Calcium Sulfate, and Magnesium Sulfate. Please let me know how I can differentiate these.
I'm new to forensics this year, but I've been trying to find the best and most time efficient method for the qualitative analysis. There are just 4 powders that seem to have the same results for all of the tests we are given. The powders I've been having a problem differentiating are Sodium Acetate, Sodium Chloride, Calcium Sulfate, and Magnesium Sulfate. Please let me know how I can differentiate these.
- pikachu4919
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Re: Forensics C
- sodium acetate will smell like vinegar (because it forms some acetic acid) and has a slightly basic pHartsygirl34 wrote:Hi Guys,
I'm new to forensics this year, but I've been trying to find the best and most time efficient method for the qualitative analysis. There are just 4 powders that seem to have the same results for all of the tests we are given. The powders I've been having a problem differentiating are Sodium Acetate, Sodium Chloride, Calcium Sulfate, and Magnesium Sulfate. Please let me know how I can differentiate these.
- sodium chloride literally doesn't do anything and has a neutral pH. Plus, it's table salt - it's very cubic.
- calcium sulfate doesn't really dissolve in water. Plus, clue: it's Plaster of Paris.
- magnesium sulfate will dissolve in water but form a precipitate when you add NaOH to it.
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
About me || Rate my tests!
Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
MY CABBAGES!
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
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Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
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Re: Forensics C
Wait, I might have seen you at Princeton! My partner and I represented Charter School of Wilmington B and we got 3rd place in forensics. Thanks for your help on forums!pikachu4919 wrote:- sodium acetate will smell like vinegar (because it forms some acetic acid) and has a slightly basic pHartsygirl34 wrote:Hi Guys,
I'm new to forensics this year, but I've been trying to find the best and most time efficient method for the qualitative analysis. There are just 4 powders that seem to have the same results for all of the tests we are given. The powders I've been having a problem differentiating are Sodium Acetate, Sodium Chloride, Calcium Sulfate, and Magnesium Sulfate. Please let me know how I can differentiate these.
- sodium chloride literally doesn't do anything and has a neutral pH. Plus, it's table salt - it's very cubic.
- calcium sulfate doesn't really dissolve in water. Plus, clue: it's Plaster of Paris.
- magnesium sulfate will dissolve in water but form a precipitate when you add NaOH to it.
- pikachu4919
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Re: Forensics C
Stefannli wrote:Wait, I might have seen you at Princeton! My partner and I represented Charter School of Wilmington B and we got 3rd place in forensics. Thanks for your help on forums!pikachu4919 wrote:- sodium acetate will smell like vinegar (because it forms some acetic acid) and has a slightly basic pHartsygirl34 wrote:Hi Guys,
I'm new to forensics this year, but I've been trying to find the best and most time efficient method for the qualitative analysis. There are just 4 powders that seem to have the same results for all of the tests we are given. The powders I've been having a problem differentiating are Sodium Acetate, Sodium Chloride, Calcium Sulfate, and Magnesium Sulfate. Please let me know how I can differentiate these.
- sodium chloride literally doesn't do anything and has a neutral pH. Plus, it's table salt - it's very cubic.
- calcium sulfate doesn't really dissolve in water. Plus, clue: it's Plaster of Paris.
- magnesium sulfate will dissolve in water but form a precipitate when you add NaOH to it.
Yes, I was there. I was the one in the black lab coat with a very loud voice (the EHS guy in the blue lab coat compared it to Frau from Austin Powers, although I’m not quite sure I actually yell like that). And I was also the one trolling with answering all your questions about Princeton Invitational, which I found kinda funny since I was the supervisor, after all. I’m glad you did well!Stefannli wrote:That message was for Pikachu
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
About me || Rate my tests!
Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
MY CABBAGES!
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
About me || Rate my tests!
Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
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Re: Forensics C
Ah, sadly I don't remember that. Are you a guy or a girl? All I remember was the guy in the blue lab coat that looked like Grant Imahara from the now nonexistent mythbusters. Also, I was the guy with the top knot/very small pony tail w/glasses.pikachu4919 wrote:Yes, I was there. I was the one in the black lab coat with a very loud voice (the EHS guy in the blue lab coat compared it to Frau from Austin Powers, although I’m not quite sure I actually yell like that). And I was also the one trolling with answering all your questions about Princeton Invitational, which I found kinda funny since I was the supervisor, after all. I’m glad you did well!
Last edited by Unome on February 13th, 2018, 3:35 pm, edited 1 time in total.
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Re: Forensics C
Woops, still not sure how to use the forum features... Also I meant to ask if you were a man or woman, so excuse my disrespectful manner. I'm just trying figure out which of the supervisors was you.
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