[CHM 112] Lab Report

[Andrew J. Pounds]

On 04/23/14 15:05, Ashley Elizabeth Ray wrote:
>
> Hi Dr. Pounds,
>
> I have a few more questions about this week's lab report. After 
> calculating the Ksp values, I found that all of the In(Ksp) values are 
> negative. When I made the graph of 1/Temperature and In(Ksp) the slope 
> is negative instead of positive. I am not sure where I made a mistake 
> if any. Thanks for your help.
>
> Respectfully,
>
> Ashley Ray
>
$\Delta G = -RT \ln K = \Delta H - T \Delta S$

$-RT \ln K = \Delta H - T \Delta S$

$ \ln K = -\frac{\Delta H}{RT} + \frac{T \Delta S}{RT}$

$\ln K = -\frac{1}{T} \frac{\Delta H}{R} + \frac{\Delta S}{R}$


So the line should have a negative slope (m) which is equal to negative 
Delta H over R.

Now ask yourself -- is this an endothermic or exothermic process? The 
sign of Delta H should reflect this.




-- 
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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