1.
What did you observe during the evaporation technique?

Data Analysis
2.
Calculate and record the following quantities.
a mass of the beaker with NaCl after boiling away the water (g)
87.620g
b
mass of NaCl obtained after boiling away the water (g)
2.62g
3.
4.
The amount of sodium chloride in the original mixture can be determined
indirectly by subtracting the masses of ammonium chloride and sand from the
initial mass of the powdered mixture. Calculate the percent difference between
the results from the two methods using the following equation:
% difference = |(measured mass) − (mass by subtraction)| / (mass by
subtraction) × 100%
This formula hasreally confused me. I can find the amount of sodiumchloride in the
original mixture by subtracting themass of NH4Cl (1.222g) and SiO2 (6.158g) from
theoriginal 10g which leaves me with 2.62g for the NaCl. when i measured the NaCl on
the scale i got 87.620g with beaker meaning the NaCl alone weighed 2.62g. If i use these
numbers in the equation my percent difference is 0%.
Conclusions
1.
How is this lab using the difference in the physical properties of the powdered
mixture components to separate them?

2.
Suppose a student is given 5.375 g of a powdered mixture to separate. Because
the mixture contains iron shavings, he decides to separate them using a magnet.
He obtains 1.824 g of iron. What is the mass percent of iron in the mixture?

3.
How could the setup in the figure above be used to recollect the water added in
experiment 3?