Question

Part 3

1. Calculate and record the following (in grams):

a mass of the beaker with NaCl after boiling away water (g) 87.620g
b measured mass of NaCl after boiling away water (a minus the mass of the beaker from Experiment 2) (g) 2.620g

Answer 1

Calculate and record the following (in grams):

a mass of the empty evaporating dish (g) 76g
b mass of the evaporating dish plus the powder mixture sample (g) 86g
c mass of the sample, b minus a (g) 10g
d mass of the evaporating dish and the remaining contents after sublimation (g) 84.778g
e Subtract (d) from (b) to obtain the mass of NH4Cl in the sample (g) 1.222g








Part 2

1. Calculate and record the following (in grams):

a mass of empty beaker # 1 85g
b mass of the beaker with the SiO2 after decanting 93.778g
c mass of empty beaker # 2 85g
d mass of the SiO2 (b minus a) 8.778g








Part 3

1. Calculate and record the following (in grams):

a mass of the beaker with NaCl after boiling away water (g) 87.620g
b measured mass of NaCl after boiling away water (a minus the mass of the beaker from Experiment 2) (g) 2.620g



2. Determine the amount of sodium chloride (NaCl) in the original mixture indirectly by adding the masses of ammonium chloride (experiment 1, row e) and sand (experiment 2, row d) together and subtracting the sum from the initial sample mass of 10 g.

1.222g+8.778g-10g=0g





3. Calculate the percent difference between the results from the two methods from the following equation:

% difference = |(measured mass) - (mass by subtraction)| / (mass by subtraction) * 100%








4. Based on your experimental results, which is the preferred method of separation?









5. What is the mass percent of each component in your mixture? To determine the mass percent, divide the mass of the component by the mass of the total 10g sample and multiply that result by 100.

a % NH4Cl 12.2%
b % SiO2 87.8%
c % NaCl 26.2%

Answer 2

@PRAETORIAN.10