Chem and Physics labs

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abbcossni
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Re: Chem and Physics labs

Postby abbcossni » December 5th, 2008, 5:28 pm

I think the titration race makes it sound like fun. in class whenever we have to do a titration my friends and i always race. it's not super accurate, but its fun!
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Re: Chem and Physics labs

Postby iwtban » December 29th, 2008, 6:55 pm

how do you practice to do good on titration race? i mean, the titration lab is pretty simple; and do you think that i should practice on diprotic acid and stuff? thanks.

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Re: Chem and Physics labs

Postby dickyjones » December 29th, 2008, 7:32 pm

Yeah, it's not that difficult...and is probably way overcurved. Hopefully, the judges will find a way to score it fairly. To practice, just make someone on your team make an acid/base of some given molality and then do the titrations. Try to do it at least once with each of: a pH probe, phenolphthalein, burettes, and pipettes. Just get a good method with your partner that won't leave one of you doing nothing while the other does the whole titration.

I wouldn't expect diprotic acids for the titration race, but I'd prepare for them for the rest of the labs/questions. They could do more than one titration the way the rules are written.
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Re: Chem and Physics labs

Postby iwtban » December 29th, 2008, 8:09 pm

what do they mean about "calculating standard deviation"; can anyone please explain? thanks.

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Re: Chem and Physics labs

Postby dickyjones » December 29th, 2008, 8:19 pm

It means that you have to do the titration more than once (probably, three times would be a good number).

Standard deviation is the square root of the sum of the deviations of each trial the mean of all trials divided by one minus the number of trials....yeah...look here
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Re: Chem and Physics labs

Postby iwtban » December 29th, 2008, 8:22 pm

thanks, that's so helpful :D

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Re: Chem and Physics labs

Postby ovhs_soinc_nerd » January 26th, 2009, 12:51 pm

This is my first year doing the Chem. Lab and I am really excited. I am a sophomore this year but last year a senior competed for us so I am a tad worried but titration is always fun. We completed a long titration lab in November in my Organic class and I thought it was really neat. Hopefully, my skills are too poor for a race! Any suggestions?
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Re: Chem and Physics labs

Postby SuperBeast » January 26th, 2009, 1:20 pm

You dont need to study much for physics lab. The test is a joke. The main thing you need to have is a fan that can generate a heck of a lot of voltage :P

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Re: Chem and Physics labs

Postby Sheogorath » January 26th, 2009, 1:35 pm

It isn't really a race per say, I do believe that the time is a tie breaker.
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Re: Chem and Physics labs

Postby iwtban » January 27th, 2009, 11:33 am

they ask for standard deviation, so how many times you would suggest to do the titration? thanks.

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Re: Chem and Physics labs

Postby Sheogorath » January 27th, 2009, 6:02 pm

It depends on how the test is setup. At our invintational we only had enough supplies and time for one titration, the rest was a test on acids and bases. I'm not quite sure how regionals will be run. Three sounds like a good number though, but that's just me spitballing.
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Re: Chem and Physics labs

Postby adam124218 » January 28th, 2009, 11:50 am

iwtban wrote:they ask for standard deviation, so how many times you would suggest to do the titration? thanks.

Our regional directors said that there will be supplies for three runs. That seems to be what the SO rule-writers have in mind--at least that would be my assumption.

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Re: Chem and Physics labs

Postby iwtban » January 28th, 2009, 2:07 pm

thanks for all the replies.
for anyone who has competed at invitationals this year, i want to ask if the test was hard and how did the judges grade the titration race?

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Re: Chem and Physics labs

Postby dickyjones » January 28th, 2009, 5:38 pm

Our test was actually pretty easy. Most of the stuff you would have learned in an AP chem class..just the titration as the lab with a bunch of mostly calculation based questions. Our coach actually ran the event at invites, and I know that only two teams of 14 got close to the actual concentration (we were closest with .003 off...). He took poetic license with the scoring of it, though. He gave a sheet on which you had to show all work/calculations with final answers and the work was worth like 20%, final answer was worth like 20%, and proper lab procedure was worth 10% of the total score. We got like a 47/50. I personally liked the method of scoring a lot better, but it'll likely be MUCH different at real tournaments (closer to how the rules say). There was a huge spread of scores...we won by like 20 with about 84 points, and I know the second to last team had a score of 4.5.
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Re: Chem and Physics labs

Postby iwtban » January 28th, 2009, 10:21 pm

thanks for your detailed description of the event. So, at your invitational, for the titration, did they ask to calculate the concentration of the acid or anything else? Thanks.


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