Mass of copper used_ Mass of filter paper0.1029 Mass of 100/150 mL beaker58.7606

Question

Mass of copper used_ Mass of filter paper0.1029 Mass of 100/150 mL beaker58.7606 Mass of beaker plus filter paper plus dry copper59.7859 Calculations and Questions 1. Calculate the mass of copper recovered and the percent recovery of copper. 1.0686 2. a) According to the law of conservation of mass, what should the percent recovery of copper be? b) Were your results consistent with the law of conservation of mass? c Suggest three places in the experimental method where copper might be lost either as the pure element or a copper compound and thus cause the percent recovery to be too low d) Suggest two things (other than weighing errors) that would cause the percent recovery of copper to be too high.

Explanation / Answer

Q1.

mass of copper recovered = (59.7859-58.7606-0.1029) = 0.9224 g recovered

Q2.

accordingt to conservaiton law:

mass initial = mass final stage

then

yield = 1.0686 g (theoretically)

b)

no, they are not, since we are "losing" mass

actually, we are not recovering at 100%

c)

- incorrect manipulation of balance

- allowing solids to fall from the filter paper

- paper has burnt

d)

if it will be high, is mainly because:

- there is still humidity present in the sample

- beaker is still humid

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