Posted by **Megan** on Thursday, May 6, 2010 at 2:22pm.

I really don't know how to approach this problem and I really need help.

Using the average molarity of your initial acetic acid solutions, the initial volumes, and the volume of NaOH added to reach the equivalence point, calculate the [C2H3O2-] concentration at the equivalence point.

# of Trials Initial V(HC2H3O2) Vol(NaOH) pH(equiv. Pt.) [OH-] C2H3O2-](eq. Pt.)

Trial 1: 31.1 21.8 7.27 1.86E-007

Trial 2: 30.1 21.7 7.10 1.26E-007

Trial 3: 29.9 24.7 7.13 1.35E-007

- Chemistry -
**DrBob222**, Thursday, May 6, 2010 at 2:38pm
I have tried to make sense of this post and can't. It isn't your fault; the problem is that the board doesn't recognize spaces over one(1). You also run into problems if the amount of material covers more than one line. I suggest you do this vertically instead of horizontally. This is really a simpler problem and I can help if we can get the data straight.

Example:

Trial 1

volume acetic acid =

volume NaOH =

etc.

I am a little confused by the following:

initial volume HC2H3O2. Is that what you started with?

How much of this is your calculation versus experimental observation?

I don't get the 1.86E-007, especially the 007 part.

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