1. If you had a mixture that contained, NaCl, what is the mathematical expressio

Question

1. If you had a mixture that contained, NaCl, what is the mathematical expression that would show percent NaCl in the mixture? (2 points)

2. In this lab you will determine the percent composition of a mixture, you will be isolating NaCl and SiO2 from a mixture. You begin the day with a sample that has a total mass of 3.24g and after a few separations you have isolated the NaCl from that sample. With the NaCl in hand you determine that it has a mass of 1.29g, what is the percent NaCl in this sample? (2 points)

3. From the 3.24g sample where you extracted 1.29g of NaCl, after doing a little more work you finished the SiO2 recovery – you determined that there was a total of 2.15g of SiO2, what is the percent SiO2 in your sample? (2 ponts)

4. After looking at your data, you realize that the masses of your recovered samples don’t make a lot of sense, what is the total mass recovered (mass of SiO2 + mass of NaCl)? (1 points)

5. With the total mass of the recovered sample as well as the mass of the original sample, what is the percent recovered?

Explanation / Answer

1) % NaCl in the mixture = (mass of NaCl in the mixture/total mass of the mixture) * 100

2) Mass NaCl in sample = 1.29 g

Total mass of sample = 3.24 g

% NaCl = (1.29/3.24) * 100 = 39.81%

3) Mass of SiO2 in sample = 2.15 g

% SiO2 = (2.15/3.24)*100 = 66.36%

4) Total mass of recovered sample = 1.29 + 2.15 = 3.44 g

5) % recovered = (Total mass recovered/total original mass) * 100

= (3.44/3.24) *100 = 106.17%

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