NEUTRALIZING POWER OF ANTACIDS

Due Today: 1. Neutralizing Power of Antacids Pre-Lab

2. Acid-Base Short Lab Report

Homework:1. Neutralizing Power of Antacids Formal Lab Report

2. Iron Content Analysis Pre-Lab

Measure neutralizing capacity of a

commercial antacid

Determine which brand is most cost

effective

OBJECTIVE

Part I: Standardizing NaOH

Completed in Acid-Base Titration Lab

PROCEDURE NOTES

Part II: Titration with simulated Stomach Acid

Use GRADUATED pipettes

Add bromophenol blue indicator

Yellow → Blue

Make sure there is no green tint!

PROCEDURE NOTES

Part III: Stomach acid/Antacid Reaction

Record all pertinent information from

packaging

Use GRADUATED pipets

GENTLY heat

Heat no higher than 3

Some solids may remain

Keep track of the # of pipets added

PROCEDURE NOTES

Part IV: Neutralizing excess Stomach Acid

Use GRADUATED pipets

Add bromophenol blue indicator

Yellow → Blue

Make sure there is no green tint!

PROCEDURE NOTES

Titrated solutions → dispose in the sink

Excess NaOH → place in large carboy

WASTE

Hydrochloric AcidDanger Inhalation HazardCorrosive

Sodium HydroxideDanger Inhalation HazardCorrosive

RISK ASSESSMENT

Total Moles of HCl added to antacid:

V= (total number of pipets used) 1 Pipet = 25.00 mL

CALCULATIONS

Moles neutralized per dose

Dose of antacid per dollar

CALCULATIONS

Moles HCl neutralized per dollar

You must collect ALL groups moles/$ values

CALCULATIONS

Antacid Active Ingredients Price Quantity Dose

Rolaids $4.99 150 tablets 3 tablets

Tums $5.79 150 tablets 3 tablets

Mylanta $6.29 12 fluid ounces 3 teaspoons

Maalox $5.89 12 fluid ounces 3 teaspoons

Milk of Magnesia

$6.49 12 fluid ounces 2 teaspoons

ANTACID INFORMATION

Antacid

average experimental neutralizing

capacity per dollar

theoretical moles HCl neutralized per

dose

theoretical neutralizing Capacity

per Dollar

percent difference

Rolaids        

Tums        

Mylanta        

Maalox        

Milk of Magnesia        

COST EFFECTIVENESS COMPARISON