[CHM 111] Lab prep for Wednesday

[Andrew J. Pounds]

On Wednesday you will be doing the first of two titration labs.  These 
labs are different from prior labs in the following way.

1. They will be conducted individually (each person gets their own buret)

2. There will be an accuracy component to the grading.

Your work tomorrow will directly affect the accuracy of the results next 
week -- so you have to make sure you are doing things correctly.  Please 
review the procedures for using a buret 
<http://cla.mercer.edu/www/mu-cla/chemistry/general-lab/upload/Using-a-buret.pdf>. 
All of your buret readings to be to the hundredth of a ml (0.01).  
Remember that in this experiment the BASE goes in the buret and you will 
titrating the acid in the erlenmeyer flask. Remember -- only use the 
NaOH that you prepared. You NaOH and your partners NaOH will have 
different concentrations and you have to use the same one each time to 
have any chance of getting accurate results.

Every student should do SIX titrations in lab tomorrow.   One titration 
will be done quickly to establish roughly how much sodium hydroxide is 
required to neutralize the acid and then you will do FIVE good 
titrations.   This sounds like a lot, but well prepared students have 
finished this lab in under 90 minutes.

Please prepare your lab notebooks so that you have places to record data 
for six titrations.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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