Exp 5 pre-lab

[robert zellmer]

I've received some inquiries about exp 5 and the pre-lab.

Since we finished some of the material that applies to exp 5 I wanted
to make sure you could answer all the questions from just the lab manual.
The majority of what you need to complete the pre-lab is contained in the
lab manual for exp 5.  You will need an understanding of formula weights,
the "mole" and molar mass.  These are covered in sections 3.3 and 3.4.
For further reading on ionic equations, acids and bases, and neutralization
reactions see sections 4.2 and 4.3.  Solution stoichiometry and titrations
are covered in section 4.6.   You should consider waiting to attempt
the pre-lab until you've finished learning this material and doing the
homework for these sections.  You pretty much need to w/in the next
day or so any since we have a review and test coming up.

Before attempting the pre-lab you should read the Discussion section
and review the calculations.  Write the procedure so you have some
idea where the numbers are coming from. Watching the video at home
before writing the procedure will help (you can find the videos on my
web page at the "Laboratory" link).  It will give you better idea of what's
going on so the procedure makes sense.  The procedure MUST be
written in your own words in an outline form similar to my example
on the last page of the syllabus (and found at a link 
<http://chemistry.osu.edu/%7Erzellmer/chem1250/lab/notebook_proc_1250.pdf>on 
my class web
page).  Pay attention to the equations and the examples in the manual
since the calculations you'll be doing are very similar.

In Part A of the exp you'll be using something with an acronym of KHP.
People often mistakenly think KHP is potassium hydrogen phosphorus.
It is *NOT*.  KHP is an acronym for potassium hydrogen phthalate,
KHC8H4O4.  It is a salt consisting of K^+ and HC8H4O4^- . The latter
is a weak monoprotic acid (hydrogen phthalate).

The link for the pre-lab is in the syllabus, on Carmen and my web page so
if the following doesn't seem to work from your e-mail you can find it
somewhere.

https://uglabs.cbc.osu.edu/1250/pre-postlabs.php

This will take you the main Chem 1250 pre and post-lab page.
READ this page and the Terms and Conditions of Use if you didn't
do it already.

The pre-lab essentially consists of two parts.  The first part starts with
a video, which you need to watch all the way through (including the
credits) or you will have have points deducted.  Then there is a series
of questions dealing with the discussion and procedure in the manual
and the video.

Below this part is the data-entry part of the pre-lab. You'll be given
numbers similar to what you'll obtain in the actual experiment. You will
then do the appropriate calculations and enter the numbers (make sure
you have the correct sig. fig.).  That's pretty much it.

Once you click on the pre-lab or data-entry links you'll get a new screen.
There is an INSTRUCTIONS button in a red box toward the upper-left of
the page.  Click on it before you start.  Pay attention to what it's 
telling you
to do in terms of units, how to enter the numbers, etc.  The program will
send you an e-mail if the pre-lab was submitted correctly.  Also, the screen
should refresh with your entries and results and score.  If it doesn't 
it didn't
submit properly.

Dr. Zellmer
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osu.edu/pipermail/cbc-chem1250/attachments/20180126/0b1acfd6/attachment.html>