anyone know how to get the molarity of the analyte?

10/30/2005 3:14:19 PM

molaity (of titrant) x volume (of titrant) = molarity (of analyte) X volume (of analyte). Molarity for the titrant is given. Volume of the titrant can be read off the charts (the volume at which there is a horizontal line is the volume you want since you're using the equivalence point to do this). Volume of the analyte is given. Once you get the hang of reading the chart, you're set. Does that help?

10/30/2005 4:02:29 PM

Thanks for the info. it really helped. any help w/ the pKa's?

10/30/2005 5:48:54 PM

Read from the graph what the pH is at the midpoint, which will be the analyte pKa.

10/31/2005 3:55:15 PM

I really hated doing this titration crap I thought the lab was terrible.

10/31/2005 4:36:57 PM

I thought it would have been much better if they had us do only one titration, and that way give sufficient time for the TAs to introduce the concepts, and for us to get through the in-lab. The rushed frenzy of doing two simply led to frustration. Webassign's "grading" of the in-lab is horrible - my TA watches me do a problem, does it along with me, I do it correctly, but I'm still "off" from the official answer so it's wrong. It's a ridiculous "plug and chug" way to approach a complicated process.

10/31/2005 10:42:21 PM

^yes, my thoughts exactly.

11/1/2005 5:21:47 PM

I was actually glad we had the 2 different titrations. It did take a while, but that lab actually helped me gain a much better understanding about both the titration process and polyprotic acid stuff, and how to get info from the curves in general.

I think the TA did a good job of quickly presenting the relevant info we needed in the first few moments of lab, so that we werent lost when we actually did the lab.

11/5/2005 8:59:34 AM

I guess if they would make the info the TA's need to present a uniform presentation that would help with that a lot. My TA was sort of frenzied, just throwing various things on the board before saying, "But just get started." It didn't help that the lab section before us did not clear out on time (in fact, the last of them left as my lab was supposed to begin) so the TA did not have time to get in, prepare stuff on the board, check the reagents, etc.

11/5/2005 10:24:47 AM