CHEM 14BL Chapter Notes - Chapter 2: Atomic Mass, Spectrophotometry, Horse Length
25 Aug 2015
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Digital balance: 0. 2 mg = 0. 0002 g. *you will be using these absolute errors in your pre-labs and post-labs. Random error: error from unknown source (i. e personal errors: examples in pipet lab: misreading the line of where the meniscus; spilling of solution; excess transfer of water, etc. Relationship between % rad and % inherent error. Purpose of calibration: to check experimenter"s precision/ accuracy of lab equipment. A comparison between % rad and % inherent error is used to check if the experiment was performed within the precision warranted by the equipment. % rad = measure of precision of data (of the trials completed) % inherent error = measure of precision of lab instrument used. Experiment was performed within the precision warranted by the equipment; no need to repeat the experiment. Experiment was not performed within the precision warranted by the equipment; experiment should be repeated.
