Lecture 1292014.pdf

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Department
Chemistry
Course
CHEM 2121
Professor
Nicholas Frost
Semester
Spring

Description
Lecture 1292014Wednesday January 29 20141220 PMError PropagationThe real rule for sig figsMultiplication and Division222eSqrte e e123Relative Error UncertaintyUsing a volumetric flask w error of 008 mL10000 mL100100 008Ex on multiplicationdivision 01053 gNaOH1 mol NaOH39997 g NaOH1010000L0026327M222Sqrt00005g01053g 39997 008 mL10000 mLhow to do error for the weight can assume 1 for last digit inso in this case its 7 so put 0001 for error there0026327 M000482000127 M Final answer 00263 00001 MWhen you use the rule of last digit1st uncertainty digit might lose sig figs but wont gain anyCan also express answer as 0026300001M shows where precision ends but gives more info if want
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