Chem 1LD Expt 3+4 (ASPIRIN SYNTHESIS &
ANALYSIS) Questions With Complete Solutions
______ the crystals for 15 minutes in the _________ and then
place them on a labeled, pre-weighed ______________ in the
oven for at least 10 minutes. You should check the temperature
on the oven... if the temperature exceeds 65 °C, your product
will decompose. Place Plate #3 into the developing chamber.
Correct Answers dry, filter, watch glass,
____________ the vial from the water bath and carefully add
_____ drops ________________. Wait one minute. If
precipitation does not begin add 15 more drops of H2O. If
precipitation does not occur after 5 minutes, go on to the next
step. Correct Answers remove, 15, distilled H2O
6. Using the data from your Beer's Law plot, calculate:
a. The exact mass (in grams) of ASA in your aspirin unknown.
Correct Answers M = mol / L
- find mass in concentrated solution
Add _____ drop ________ solution to each test tube. Correct
Answers 1, FeCl3(aq)
Add a __________ or "________" of each sample to its test tube
Correct Answers crystal, pinch
After all solid disappears from the reaction mixture, use a pipet
to remove ______ drops of solution. Use a ______ TLC spotter
and spot the removed solution on the right of the origin line of
Plate #3 (Sample B). Place the plate aside, you can develop it
, following the directions for the first two plates once you have
your ASA product drying in the oven. Correct Answers 2-3,
new
b. The mass percent of ASA in your aspirin unknown. Correct
Answers mass % = (mass of chemical/total mass of compound)
x 100
b. The standard solutions (#1-5) were prepared by transferring
exactly 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, and 5.00 mL,
respectively, of stock solution to clean 100-mL vol flasks,
diluting to the mark with FeCl3 solution, and then filling the
appropriately labeled cuvette. Correct Answers (concentration
of ASA) (1 mL) / 100 mL) = conc. cuvette #1
- #2-5 calculated same way (but with 2 mL, 3 mL, etc)
b. What are the volumes of containers 1-4? Correct Answers
Container 1 = 10 mL of solution in 125 mL Erlenmeyer Flask
Container 2 = 100 mL
Container 3 = 1 mL
Container 4 = 50 mL
Begin gently stirring and heating the mixture in a ______ water
bath. Continue heating and stirring until all solid ___________
(about 10 minutes). Correct Answers 50 °C, disappears
c. What is step B called? What volumes are known in the
equation underneath the arrow of step B? What are their values?
Correct Answers dilution
Mconc * Vconc = Mdil * Vdil
ANALYSIS) Questions With Complete Solutions
______ the crystals for 15 minutes in the _________ and then
place them on a labeled, pre-weighed ______________ in the
oven for at least 10 minutes. You should check the temperature
on the oven... if the temperature exceeds 65 °C, your product
will decompose. Place Plate #3 into the developing chamber.
Correct Answers dry, filter, watch glass,
____________ the vial from the water bath and carefully add
_____ drops ________________. Wait one minute. If
precipitation does not begin add 15 more drops of H2O. If
precipitation does not occur after 5 minutes, go on to the next
step. Correct Answers remove, 15, distilled H2O
6. Using the data from your Beer's Law plot, calculate:
a. The exact mass (in grams) of ASA in your aspirin unknown.
Correct Answers M = mol / L
- find mass in concentrated solution
Add _____ drop ________ solution to each test tube. Correct
Answers 1, FeCl3(aq)
Add a __________ or "________" of each sample to its test tube
Correct Answers crystal, pinch
After all solid disappears from the reaction mixture, use a pipet
to remove ______ drops of solution. Use a ______ TLC spotter
and spot the removed solution on the right of the origin line of
Plate #3 (Sample B). Place the plate aside, you can develop it
, following the directions for the first two plates once you have
your ASA product drying in the oven. Correct Answers 2-3,
new
b. The mass percent of ASA in your aspirin unknown. Correct
Answers mass % = (mass of chemical/total mass of compound)
x 100
b. The standard solutions (#1-5) were prepared by transferring
exactly 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, and 5.00 mL,
respectively, of stock solution to clean 100-mL vol flasks,
diluting to the mark with FeCl3 solution, and then filling the
appropriately labeled cuvette. Correct Answers (concentration
of ASA) (1 mL) / 100 mL) = conc. cuvette #1
- #2-5 calculated same way (but with 2 mL, 3 mL, etc)
b. What are the volumes of containers 1-4? Correct Answers
Container 1 = 10 mL of solution in 125 mL Erlenmeyer Flask
Container 2 = 100 mL
Container 3 = 1 mL
Container 4 = 50 mL
Begin gently stirring and heating the mixture in a ______ water
bath. Continue heating and stirring until all solid ___________
(about 10 minutes). Correct Answers 50 °C, disappears
c. What is step B called? What volumes are known in the
equation underneath the arrow of step B? What are their values?
Correct Answers dilution
Mconc * Vconc = Mdil * Vdil
