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April 18, 2014

April 18, 2014

Posted by **Petty** on Thursday, September 22, 2011 at 6:41am.

- Chemistry help pliz -
**Petty**, Thursday, September 22, 2011 at 6:44amcontinued from above calculate the initial pH of the acetic acid-sodium acetate solution above.The pKa of acetic acid is 4.76

- Chemistry help pliz -
**Dr Russ**, Thursday, September 22, 2011 at 7:05amTo do the second part from first principles. Start with the acid dissociation equation:

HAc -> H+ + Ac-

Ka is then

[H+][Ac-]/[HAc]

at the start

HAc -> H+ + Ac-

1.0 M ___0__1.0M

at the end

HAc -> H+ + Ac-

1.0-x__x___1.0+x

so Ka is

Ka=(x)(1.0+x)/(1.0-x)

we can treat this in two ways, we can solve for x

or

Assume that x is small so that

Ka=x(1.0)/(1.0)=x

thus pKa = pH =4.76

- Chemistry help pliz -
**DrBob222**, Thursday, September 22, 2011 at 12:33pmTo give another perspective, you can calculate the pH of a buffer using the Henderson-Hasselbalch equation.

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