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CHEM 146 Lab 5 Worksheet | 1 Lab 5 Worksheet Your name: GRADE ____ /25 p

February 21, 2024

CHEM 146
Lab 5 Worksheet |
1

Lab 5 Worksheet

Your name:

GRADE ____ /25 p

Note:
When performing calculations, always perform
dimensional analysis – that is, use conversion factors to ensure sure unwanted units cancel out during the calculation process leaving just the desired units. Avoid blindly performing mathematical operations (adding, multiplying, etc.) without checking the units for each quantity and converting to a different unit if necessary.

This assignment requires the accompanying

Lab 5 Manual
(separate document on D2L).

1. Activity 1. Evaluating the Acid-Neutralizing Capacity of Alka-Seltzer®- Back Titration.

Enter the data from
Activity 1 of this experiment into
Data Table 1 below.

Density of acetic acid (dCH3COOH) = 1.00 g/mL

Standardized NaOH solution concentration (CNaOH) = 1.0 M

Concentration of acetic acid (CCH3COOH) = 0.88 M

Data Table 1

Quantity	Trial 1	Trial 2
Mass of acetic acid (g), mCH3COOH	5.00	5.00
Mass of Alka-Seltzer® (g), mAlka-Seltzer®	3.22	3.23
Initial volume NaOH solution in syringe (mL), Vinitial	5	5
Final volume NaOH solution in syringe (mL), Vfinal	3	2.5
Total volume of NaOH solution delivered (mL), VNaOH = Vtitrated = Vinitial – Vfinal
Moles NaOH delivered (mol), molNaOH = VNaOHCNaOH
Alka-Seltzer® Neutralization Capacity (mol H+/g Alka-Seltzer®), AlkaSeltz Neu Cpty =

2. Activity 2. Analysis of Milk of Magnesia.

Enter the data from
Activity 2 of this experiment into
Data Table 2 below.

Density of milk of magnesia (dMagnesia) = 1.14 g/mL

Concentration of acetic acid (CCH3COOH) = 0.88 M

Data Table 2

Quantity	Trial 1	Trial 2
Mass of Milk of Magnesia (g), mMagnesia	2.51	2.51
Initial volume acetic acid solution in syringe (mL), Vinitial	5	5
Final volume acetic acid solution in syringe (mL), Vfinal	3	4
Total volume of acetic acid solution delivered (mL), VCH3COOH = Vtitrated = Vinitial – Vfinal
Moles CH3COOH delivered (mol), molCH3COOH = VCH3COOHCCH3COOH
Neutralization Capacity (mol H+/g Milk of Magnesia), Magnesia Neu Cpty =

4. Which antacid is the most effective (has the highest number of moles of active ingredient) per gram of antacid? Justify your reasoning.

146 Lab 5 Worksheet
v1.2

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01-20-24
UA-CBC Technical Press, University of Arizona

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