chemistry post-lab

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Experiment 4 Report Sheet

Limiting and Excess Reagents

Data Analysis

Item

Trial 1

1.  Mass Benzaldehyde used

2. Mass Acetone used

[3]  Limiting Reagent (Name)

[4]  Excess Reagent (Name)

[5]  Theoretical Yield of Dibenzalacetone (g)

  6.  Mass of filter paper (g)

7. Mass of watch glass (g)

8. Mass of watch glass, filter paper, and dried residue(g)

  [9]  Actual Yield  Dibenzalacetone (g)

  [10] Percent Yield Dibenzalacetone (%)

In the following tables, items with [bracketed] numbers (i.e. [1]) are to be computed from your experimental data.  The others are collected as part of your experiment. 

1) If you had not dried the solid, would the calculated percent yield have been higher, lower, or unchanged? Explain

2) Boron trichloride is prepared from the following reaction. 

2B2O3 + 6Cl2 + 3C -->  4BCl3 + 3CO2

If 67.0 g of B2O3 is mixed with 63.4g of Cl2 and 77.2 of C then....

a) What is the theoretical yield of boron trichloride? Report you answer in grams.

b) How much of each of the excess reactants will remain once the reaction is complete? Report you answer in grams.

3) If during the drying process your product some of the dibenzalacetone passes through the filter paper and goes into the filtrate. Will the percent yield be reported as too low, too high, or unchanged? Explain.

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