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CHEM 146 Lab 4 Worksheet | 1 Lab 4 Worksheet Your name: GRADE ____ /25 p

February 15, 2024

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 = molNaOH
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

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