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# Calculating percentage error of volumetric flask

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1. If you're using a normal 250ml grade B volumetric flask how do you know what its tolerance and percentage error is? Also if the tolerance was + or - 0.3 would you find the percentage error by doing 0.3/ 250?
2. Have a look at this website I just found:

It says a grade B 250ml volumetric flask has an accuracy of ±0.30ml.

% error = (apparatus error)/(reading) x 100
= ( 0.3 / 250 ) x 100
= 0.12%

Hope that helps..
3. Volumetrics in the lab I use are 250 ±0.40ml
i.e 1.6% error
4. A 1.6% error? I could be wrong, but don't you mean a 0.16% error?

(0.40/250)x100 = 0.16%
5. (Original post by -David-)
A 1.6% error? I could be wrong, but don't you mean a 0.16% error?

(0.40/250)x100 = 0.16%
you are right...

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