[CHM 112] Labs continued

[Andrew Pounds]

On 07/13/2015 10:16 PM,wrote:
> For some reason I wasn't able to reply using my original email. And sorry I'm confused by this, but why did we use 151 ml (for people who used two ml of the starch) for total volume in the finding the concentration of I when the mls of the deionized water, buffer, KI, starch, and n2s2o3 only equal 144?
You forgot about the peroxide -- which in the first set was 6 ml -- 
bringing the total to 150 ml (or 151 is you used 2 ml of starch).
>
> And are the total volume for the second set all different? I added up the mLs again and they 147,144,138,and 126. They would be my total volumes to divide by after multiplying (.30)*(.006) correct?
Again -- you are adding different amounts of peroxide.  PLEASE look at 
page two of the lab procedure.  It lists the volumes of peroxide that 
you have to use in the second set of experiments.  When you add each of 
those to the volumes you cited above you will get 150 ml.

>


-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627