MapoA saplingearning A student separates a 1.50 g sample of an unknown mixture o
ID: 564342 • Letter: M
Question
MapoA saplingearning A student separates a 1.50 g sample of an unknown mixture of benzoic acid, 4-nitroaniline, and benzil using an acid-base extraction procedure. After the separation, the student finds that there is 0.540 g of benzolc acid, 0.450 g of 4-nitroaniline, and 0.81 g of benzil. Calculate the total percent recovery (include three significant fiqures Number % recovery what mistakes during the extraction procedure could lead to a percent recovery above 100%? The samples were not dried Not all of the drying reagent was filtered out. The samples were left in the oven too long. The student started with too much sample enough. O Previous check Answer 0 Next ExtExplanation / Answer
Solution-
Actual mixture weight is 1.50 grams
recovere weight is 0.540 + 0.450 + 0.81 = 1.8 grams
total % =( 1.8 / 1.5) x 100
= 120 %
The two possibilities might be
1 Not all of the drying reagent was filtered out.
2 The samples were not dried enough.