[CHM 112] Question about Quiz 10

[Andrew J. Pounds]

On 07/17/14 02:41,  wrote:
>
> Hello Dr. Pounds,
>
>
> I have two questions about a step in finding the pH in question 3 of 
> Quiz 10.
>
>
> Firstly, do we add the liters from question 2 (1.5 L) to that of 
> question 3 (.4 L), making the total 1.90 L (1.0 L + .5 L + .4 L)? Or 
> should this be left as 1.4 L (1.0 L +.4L)
>
>

Yes.

> Secondly, for #3, do we find the initial concentration of HC7H5O2 and 
> C7H5O2 by following the method in slide 12 of your notes (subtracting 
> the moles of HC7H5O2 from the moles of NaOH and dividing by the total 
> L) or like in slide 15, in which an extra step is added.
>
>

Yes, but in this particular case the amount of weak acid is decreasing 
and the amount of conjugate base is increasing.

> Thank you for your help!
>
>
> Christine Okaro
>


-- 
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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