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1 Gloria and Ayeshum are conducti ofa viscous, 10% glycerol solution. ng an expe

ID: 142381 • Letter: 1

Question

1 Gloria and Ayeshum are conducti ofa viscous, 10% glycerol solution. ng an experiment that requires them to accurately measure 100 L TABLE 2-5 Manufacturers tolerances for micropipets At 100% of pipet volume At 10% of pipet volume Accuracy Precision Pipet volume Accuracy Precision (AL) Adjustable Volume 0.2-2 1-10 2.3-25 ±1.2 ±0.8 ±0.8 +0.6 +0.4 0.3 0.6 ±0.4 :0.2 ±0.15 0.15 ±0.12 ±4 2.5 +4.5 ±1.8 ±1.2 ±1.6 1.2 ±1,5 t0.7 ±0.4 +0.5 10-100 30-300 100-1 000 Fixed Volume 10 25 100 500 1 000 ±0.8 ±0.8 :0.5 +0.4 0.3 ±0.4 ±0.3 ±0.2 ±0.18 0.12 Harris, Quantitative Chemical Anolysis, Be 2011 W. H. Freeman a) Gloria selects the 100 L fixed volume micropipette and Ayeshunn selects the 10-100 L adjustable volume micropipet. Based on tolerances for micropipets in the Table above, what range of volumes (in microliters) would each expect to pipet accounting for only random error?

Explanation / Answer

Range of Volumes

40

6.25

18

9

1.6

These are the range of volumes one should pipet accounting to the random error of the given sum