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Error of Different Sized Graduated Pipettes

Hi everyone!

I'm almost there with my A2 investigation, but I'm having a little trouble finding the error (given in cm3) associated with 1cm3, 2cm3, 5cm3 and 10cm3 graduated pipettes.

I know how to calculate percentage error when I have these values, but I've trawled the internet for them and I was wondering if someone could point me in the right direction.

Thank you very much :smile:

Reply 1

Kyri

For the 1cm3 graduated pippete, if you wanted 8cm3, for example, the level of the liquid could be up to 0.5cm3 below the 8cm3 mark before you would read it as 7cm3, and up to 0.5cm3 above the 8cm3 before you read it as 9cm3. So the error associated with this pippette would be ±0.5cm3.

Using a similar idea, you can work out that the error is ±1cm3 for the 2cm3 graduated pippette, ±2.5cm3 for the 5cm3 pippette and ±5cm3 for the 10cm3 pippette. You should see the pattern that it's basically ±half the value of the degradations. Hope that helped :smile: