Question
In: Chemistry
You add 2.202 g salicylic acid to a 125 mL Erlenmeyer flask. You add 4.0 mL...
You add 2.202 g salicylic acid to a 125 mL Erlenmeyer flask. You add 4.0 mL acetic anhydride and 5 drops of sulfuric acid. After completing the synthesis, filtering, you place the crystals to dry on an evaporating dish that weights 22.067 g. After drying, the crystals and evaporating dish weigh 24.452 g. Calculate the percent yield of aspirin.
Solutions
Expert Solution
Salicylic acid + Acetic anhydride -----> Aspirin + Acetic acid
1 mole 1 mole 1mole 1mole
Actual yield
Empty weight of the dish = 22.067g
After drying empty dish + Crystals = 24.452g
Weight of Crystals = 2.385g
Actual yield = 2.385g
Theoretical yield
weight of salicylic acid = 2.202g
Molar mass of salicylic acid = 138.12g
No of mole of salicylic acid = 2.202/138.12= 0.01594
Volume of acetic anhydride = 4 ml
Density of acetic anhydride = 1.082g/ml
Mass of acetic anhydride = 1.082 ×4 = 4.328g
Molar mass of acetic anhydride =102.09g
No of mole of acetic anhydride = 4.328/102.09= 0.04239
According to stoichiometry salicylic acid is limiting
1 mole of salicylic acid gives 1mole of aspirin
0.01594 mole of salicylic acid give 0.01594 mole of aspirin
Molar mass of aspirin = 180.16g
Mass of aspirin = 0.01594 × 180.16g = 2.872g
Percentage yield
Percentage yield =( Actual yield/Theoretical yield)×100
= (2.385g/2.872g) ×100
= 83.04%
queen_honey_blossom answered 2 years agoRelated Solutions
You add 2.202 g salicylic acid to a 125 mL Erlenmeyer flask. You add 4.0 mL...
You add 2.202 g salicylic acid to a 125 mL Erlenmeyer flask. You
add 4.0 mL acetic anhydride and 5 drops of sulfuric acid. After
completing the synthesis, filtering, you place the crystals to dry
on an evaporating dish that weights 22.067 g. After drying, the
crystals and evaporating dish weigh 24.452 g. Calculate the percent
yield of aspirin.
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After we transfer a 100 ml sample of the HCl solution into a 125
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Calculate the number of Moles NaOH needed., and the Molarity of
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1. Take a 150 mL Erlenmeyer flask from the Containers shelf and place it on the...
1. Take a 150 mL Erlenmeyer flask from the Containers shelf and
place it on the workbench.
2. Add 10 mL of 6 M Hydrochloric acid (HCl) to the Erlenmeyer
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3. Double-click on the Erlenmeyer flask to open the Item
Properties window. Choose Close and click
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Mass (g) of salicylic acid 2.0083 Volume (mL) of acetic anhydride used 3.01 Mass (g) of...
Mass (g) of salicylic acid
2.0083
Volume (mL) of acetic anhydride used
3.01
Mass (g) of filter paper
0.4629
Mass (g) of watch glass
29.6710
Mass (g) of watch glass, filter paper and
aspirin
30.5178
Mass of aspirin: 0.3839
Maximum amount (g) of aspirin possible if
salicylic acid is the Limiting Reagent: ?
Maximum amount (g) of aspirin possible if
acetic anhydride is the Limiting Reagent: ?
Maximum amount (g) of aspirin possible (the
Theoretical Yield): ?
Percent Yield (%)...
Experiment 3: Measure the Mass of Air Took a 150 mL Erlenmeyer flask & a balance...
Experiment 3: Measure the Mass of Air
Took a 150 mL Erlenmeyer flask & a balance & placed them
on the workbench.
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Closed the flask & attached a pressure gauge to the
Erlenmeyer flask.
Weight of the closed Erlenmeyer flask = 88.179 g
Added 1.50 atm to the Erlenmeyer flask.
The pressure = 1.50 atm
The mass = 88.269 g
Added air to the Erlenmeyer flask to a pressure...
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