October 27, 2020, 02:31:47 PM
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### Topic: Acid-base titration question wording problem  (Read 2537 times)

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#### delsaber8

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##### Acid-base titration question wording problem
« on: January 19, 2014, 12:20:23 AM »
So, here is the scoop, I am working on a lab where some oxalic acid is titrated by some sodium hydroxide, and there is a calculation that is throwing me off: Calculate the number of moles of Oxalic Acid in 25 mL of standard solution.

I think it is the "standard Solution" part that is messing me up, because I have already found the number of moles of oxalic acid I used, by dividing the mass by the molar mass. So if someone could shed some light, on what I must do, that would be fantastic!

#### Borek

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##### Re: Acid-base titration question wording problem
« Reply #1 on: January 19, 2014, 04:31:50 AM »
Hard to tell without seeing whole thing.

Is 25 mL total volume of the solution you prepared, or just part of it?
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#### delsaber8

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##### Re: Acid-base titration question wording problem
« Reply #2 on: January 19, 2014, 02:11:28 PM »
I believe it is the total volume of oxalic acid, but once titrated with sodium hydroxide the solutions total volume increases.

#### Borek

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##### Re: Acid-base titration question wording problem
« Reply #3 on: January 19, 2014, 03:26:48 PM »
If you are not sure, please quote whole thing.

Volume change during titration doesn't change total amount of oxalate and oxalic acid. But it is most likely irrelevant to the problem.
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#### delsaber8

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##### Re: Acid-base titration question wording problem
« Reply #4 on: January 20, 2014, 08:26:36 PM »
Looks, like you were actually right the first time, I just realized that I was in fact using 25mL of a 250mL solution, so I had to find the number of moles in the smaller amount as I had already found the amount of moles for the larger solution.