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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: ILoveISO on October 10, 2009, 09:29:30 PM

Title: Quick question regarding molarity?
Post by: ILoveISO on October 10, 2009, 09:29:30 PM

In a acid base titration lab one of the questions were "Calculate the molarity of your primary standard acid solution in the 250.0ml volumetric flask"

In the answer key it shows that you put the moles of the primary acid then divide that by 250ml but first you convert the 250.0ml to L so wouldn't that be 0.250L? On the answer sheet it says 0.02500L

The question after that asks for 25.00ml yet when they change that to L it's 0.02500L as well...

Anyone know? Typo?

Title: Re: Quick question regarding molarity?
Post by: renge ishyo on October 10, 2009, 11:55:22 PM

Yeah, it looks like a typo.

250.0mL changed to L is .250L. For the volumetric flask calculation you should take your moles and divide by .250L to get the concentration. Then it says to take 25mL of this sample where 25 mL happens to be .025L. It is probably having these two back to back that led to the typo.