[CHM 111] Thermochem Lab

[Andrew J. Pounds]

On 10/4/20 11:47 AM,wrote:
> Hello Professor Pounds,
> I am currently trying to finish the last part of my lab report where I
> must manipulate the equations from reactions 2 and 3 to generate the
> equation for reaction 4. I am honestly lost as to how to do this, and
> I looked at the example of Hess's Law we did in class, but it isn't
> making much sense to me in the context of these equations. Do you have
> any tips for "jumpstarting" this process of manipulating the equations? 
>
> Thank you for your help!
>

So in reaction 2 you had ...


NaOH (s) --> NaOH (aq)


in reaction 3 you had


NaOH (aq) + HCl (aq) -> NaCl (aq) + H2O (l)


and in reaction 4 you had


NaOH (s) + HCl (aq) ->  NaCl (aq) + H2O (l)


If you add equation 2 and 3 together the NaOH(aq) will cancel you should
get equation 4.  So, if you ADD the enthalpies of equation 2 and 3
together you should get the enthalpy of equation 4.


Does that help?

-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Director of the Computational Science Program
Mercer University,  Macon, GA 31207   (478) 301-5627

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