Illustrated Guide to Home Chemistry Experiments

378 DIY Science: Illustrated Guide to Home Chemistry Experiments

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q 1 : How did your actual yield compare to the theoretical yield? Propose at least five possible
explanations for the actual yield being smaller than theoretical.

TABLE 21-1: Synthesize methyl salicylate from aspirin—observed and calculated data

Item value

A. Mass of aspirin __________. ____ g

B. Moles of aspirin (A/[180.160 g/mol]) ___.________ mol

C. Theoretical yield of methyl salicylate (B · [152.1494 g/mol])__________. ____ g

D. Theoretical yield of methyl salicylate (C/[1.1825 g/mL]) ______._____ mL

E. Mass of empty 50 mL beaker __________. ____ g

F. Volume of methyl salicylate sample ______._____ mL

G. Mass of beaker + methyl salicylate sample __________. ____ g

H. Mass of methyl salicylate sample (G – E) __________. ____ g

I. Density of methyl salicylate sample (H/F) _______. ____ g/mL

J. Temperature at which crystals begin to form ______.____°C

K. Temperature at which sample freezes solid ______.____°C

L. Temperature at which sample begins to melt ______.____°C

M. Temperature at which sample is fully melted ______.____°C