# 1 what did you observe during the evaporation

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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?
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