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Doc Brown's Chemistry
SALTERS ADVANCED LEVEL CHEMISTRY
Scribbles on Error analysis in Activities EL 1.1 and EL 2.1
Return to My Salters AS homepage - "Unit EL Elements of Life"
My Salters AS page * My Salters A2 page
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basically the % error is calculated as follows:
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the 'error for that apparatus' x 100 / effective reading
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there is guidance in the activities as to what the error is acknowledged to be
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generally it is taken to be 1/2 of the smallest unit on the scale being used
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eg if a balance weighs to 0.01g the error uncertainty is taken as 0.005g
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In the case of EL1.1 there are three weighing errors to be added together.
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BUT make sure you use the 'effective' results eg actual mass of copper etc.
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NOT the original recorded weighings, eg if you did the experiment in a test tube + Xg Cu = 15g total, and somebody else did it in a pyrex boiling tube + Xg Cu = 30g total
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the weighing error for 2dp balance is 0.005 x 100 / X
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NOT 0.005 x 100 / 15 or 30, using a heavier pyrex tube will NOT halve the weighing error!
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