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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: delsaber8 on January 19, 2014, 12:20:23 AM

Title: Acid-base titration question wording problem
Post by: delsaber8 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!

Title: Re: Acid-base titration question wording problem
Post by: Borek 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?

Title: Re: Acid-base titration question wording problem
Post by: delsaber8 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.

Title: Re: Acid-base titration question wording problem
Post by: Borek 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.

Title: Re: Acid-base titration question wording problem
Post by: delsaber8 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.

Thanks for your *delete me*