CHEM 146
Lab 4 Worksheet |
1
Lab 4 Worksheet
Your name:
GRADE ____ /25 p
This assignment requires the accompanying
Lab 4 Manual
(separate document on D2L).
1. Activity.
While performing
Activity 1, complete the
Data Table below as detailed in the
Lab 4 Manual.
Density of vinegar (dsolution) = 1.005 g/mL
Standardized NaOH solution concentration (CNaOH) = 1.0 M
Molar mass of acetic acid (Macetic acid) = 60.05 g/mol
Data Table
|
Quantity |
Trial 1 |
Trial 2 |
Trial 3 |
Trial 4 |
|
Mass of vinegar sample (g), msolution |
5.02g |
5.01 |
5.01 |
5.01 |
|
Volume of vinegar sample (mL), Vsolution = msolution/dsolution |
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|
Initial volume NaOH solution in syringe (mL), Vinitial |
11mL |
11mL |
11mL |
10.5mL |
|
Final volume NaOH solution in syringe (mL), Vfinal |
6mL |
6.2mL |
6.2mL |
6.2mL |
|
Total volume of NaOH solution delivered (L), Vtitrated = VNaOH = |
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|
Moles NaOH delivered (mol), molNaOH = VNaOHCNaOH |
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|
Moles acetic acid in vinegar sample (mol), At endpoint, molacetic acid = |
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|
Concentration of acetic acid in the vinegar sample (mol/L), Cacetic acid = 1000 (dsolution molacetic acid)/msolution |
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Weight % of acetic acid in the vinegar sample, (w/w%)acetic acid = [(Macetic acid molacetic acid)/ msolution] x 100% |
2. Final Calculations.
Using all the trials (
Trials 1 – 4) recorded in the above
Data Table, calculate the following quantities using EXCEL, and report them below.
a. (
the arithmetic mean and sample standard deviation for the 4 acetic acid molar concentration values).
b. (
the arithmetic mean and sample standard deviation for the 4 acetic acid weight percent values).
146 Lab 4 Worksheet
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01-24-24
UA-CBC Technical Press, University of Arizona
