If we use a graduated cylinder as our standard and want to calculate the error in using a beaker or a flask to measure out volumes, we would use the formula Ea = | O-A | and % Error = (( Ea )100%)/ A where Ea = actual error, O = observed value, and A = accepted value | O-A | = absolute value of the difference between the observed minus the accepted Instrument Precision 100 mL graduated cylinder 0.1 mL beaker varies flask varies pipette 0.01 mL buret 0.01 mL Example: To calibrate a 50 mL flask, a student fills the flask with water to the 50 mL mark.
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use fills varies varies graduated would use want buret
a graduated cylinder as our standard
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pipette 0.01
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the formula
to calculate the error in using a beaker or a flask
0.01 mL Example