25cm3 Measuring Cylinder Error
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ERROR - Pawan Posted by Pawan on Dec 14, 2011 in Physical Chemistry | 1 comment Apparatus Errors Every time
Percentage Error Of Burette
you make a measurement with a piece of apparatus, there is percentage error chemistry equipment a small margin of error in that measurement due to the apparatus itself. For example, no percentage error of 25cm3 pipette balance can measure an exact mass but a very expensive and precise balance may be able to measure a mass to the nearest 0.0001 g, while
100 Cm3 Measuring Cylinder Uncertainty
a cheaper, less precise balance may only measure it to the nearest 0.1 g. Errors such as this are known as apparatus error and cannot be avoided, although they can be reduced by using the most precise equipment available. For example, when measuring out 25 cm3 of a solution, a pipette is much
Uncertainty Of Pipette
more precise than a measuring cylinder. When you do quantitative experiments (those that require you to measure a quantity), you will have to calculate the total apparatus error from the sum of the apparatus error for each piece of equipment you use to make a measurement. Apparatus error for each piece of equipment = 100 x (margin of error)/(quantity measured) For example, imagine a pupil doing an experiment where she measured out 1.245 g of a base, make it up to 250 cm3 of solution in a volumetric flask, pipetted 25 cm3 of that solution into a conical flask, and then found that it reacted with 23.30 cm3 of acid in a titration using a burette. Balance (± 0.001 g) 100 x (0.001/1.245) = 0.08% Pipette (± 0.1 cm3) 100 x (0.1/25) = 0.40% Volumetric flask (± 0.1 cm3) 100 x (0.1/250) = 0.04% Burette (± 0.15 cm3) 100 x (0.15/23.30) = 0.64% Total apparatus erro
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Apparatus Error
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