Chapter1: Excel Basics
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Problem 2P
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Calculate the moles and mass of acetylsalicylic acid in each tablet (molar mass = 180.16 g/mol).
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CHEM 124 Experiment 8 Analysis of Aspirin by Back Titration
Name:
Lab Partner:
In the shaded spaces below, enter your data and results from the experiment.
Scientific Notation: To enter a number in
The LabChecker does not check significant digits. While your numerical value
scientific notation, you must use the following
may be marked correct, the significant digits may or may not be correct. This
program accepts answers within 3% of the correct answer.
format: 1.23 x 108 must be entered as 1.23E-8
Even though the lab did not show it, all concentrations are accurate to three significant digits. Please maintain three significant digits
throughout.
Data:
Concentration of NaOH
0.100
M
Solutions
Value
Mass of Aspirin Tablet #1
0.380
lg
Mass of Aspirin Tablet #2
0.376
Volume of NaOH mixed with Tablet #1
50
Volume of NaOH mixed with tablet #2
50
ImL
Standardization of HCI Trial #1
Value
Mass of Na,CO3
0.070
lg
Initial Volume of HCl in burette
26.69
ImL
Volume of HCI in burette at equivalence point
32.62
ImL
Standardization of HCI Trial #2
Value
Mass of NazCO3
0.065
lg
Initial Volume of HCI in burette
25.23
mL
Volume of HCl in burette at equivalence point
30.85
mL
Titration of NaOH / Tablet solutions
Value
Titration #1- Initial Volume of HCl in burette
23.55
mL
Titration #1- Final Volume of HCl in burette
35.48
mL
Titration #2 - Initial Volume of HCl in burette
24.84
mL
Titration #2 - Final Volume of HCl in burette
36.67
mL
Analysis:
Analysis #1
Value
Concentration of HCI from trial #1
0.22
M
Correct
Concentration of HCl from trial #2
0.22
IM
Correct
Average Concentration of HCI Solution
0.22
Correct
Analysis #2
Value
Trial 1- Moles of Acetylsalicylic acid in tablet
mol Incorrect
Trial 1- Masss of Acetylsalicylic acid in tablet
Trial 2 - Moles of Acetylsalicylic acid in tablet
Incorrect
mol Incorrect
Trial 2 - Mass of Acetylsalicylic acid in tablet
Incorrect
Analysis #3
Value
% by mass of acetylsalicylic acid in tablet #1
Incorrect
% by mass of acetylsalicylic acid in tablet #2
Incorrect
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