A mixture of NaCl and CuCO3 was dissolved in water and the resulting slurry was filtered...

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Question

A mixture of NaCl and CuCO3 was dissolved in water and the resulting slurry was filtered...

A mixture of NaCl and CuCO3 was dissolved in water and the resulting slurry was filtered into a beaker. The beaker and the filter paper were dried ans weighed.

Mass of container: 44.157g

Mass of container and mixture: 46.377g

Mass of filter paper: 1.176g

Mass of filter paper and residue: 2.966g

Mass of beaker: 77.475g

Mass of beaker and dried residue: 78.856g

1. Mass of mixture?

2. Mass of NaCl?

3. % NaCl (w/w)?

4. Mass of CuCO3?

5. % (w/w) CuCO3?

6. Do the percentages add up to 100% in this example? Why or why not? What do you think happened?

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