[CHM 112] CHM 112.003 Lab

[Andrew J. Pounds]

On 02/20/2015 08:55 PM,wrote:
>
> ​Dr. Pounds,
>
>
> I'm working on the lab for tuesday, and on the report form it asks for 
> information I^- ​. Do we just use the information given for KI like 
> Molarity (0.30M) and the number of ml, or do we need to do other 
> calculations to separate the K and I?
>
>
> Thank you,
>
>
So you added the I- to your solutions when you added KI.  KI is a strong 
electrolyte and completely dissociates when placed in water. As such the 
molarity of the I- ion is equal to the molarity of KI. You will need, 
however, to use the diluted value of I- in your calculations.  For that 
you can use the dilution equation $M_1V_1=M_2V_2$. Let me know if you 
get stuck or have further questions.

Also remember that your final volume in each flask is 151 ml and not 150 
ml.

-- 
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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