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 | ||||
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 = | ||||
Moles NaOH delivered (mol), molNaOH = VNaOHCNaOH | ||||
Moles acetic acid in vinegar sample (mol), At endpoint, molacetic acid = | ||||
Concentration of acetic acid in the vinegar sample (mol/L), Cacetic acid = 1000 (dsolution molacetic acid)/msolution | ||||
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
v1.3
MY © 2024
01-24-24
UA-CBC Technical Press, University of Arizona
