Name: _________
Chemistry Culminating Activity- SNC2P
The Effectiveness of Antacids
Purpose:In this lab you will be investigating the effectiveness of 3
different over-the-counter antacids (Tums, Rolaids and a Generic brand).
1. Record your data on a table provided.
Use the following information
1 eyedropper = 1 mL
1 drop = 0.1 mL
Volume of Acid Neutralized = Volume of Acid- Volume of NaOH
2. A bar graph would be the best way to illustrate the results.
3. Use your results to answer the following questions in complete
sentences.
Materials
- three different antacids (generic brand, tums, Rolaids)
- mortar and pestle
- 50 ml beaker
- eyedropper
- pH indicator
- solution of NaOH base
- solution of HCl acid
- graph paper
Procedure (arrange the steps here in the correct order):
Results: Record your results in the table below
Tablet Type
Volume of
Acid
Number of
Drops of
NaOH (Base)
Volume of
NaOH used
Volume of
Acid
Neutralized
by the
Antacid
5 ml.
5 ml.
5 ml.
Questions (Answer in Complete Sentences When Required)
1. Create a correctly titled and labeled graph showing the volume of
acid neutralized by each antacid on the graph paper provided. (6
communication marks)
2. Look at the ingredients of each of the tablets and identify the
“Active Ingredients” in each brand. (application - 3)
Brand Name: _____________ Active Ingredient(s):____________
Brand Name: _____________ Active Ingredient(s):____________
Brand Name: _____________ Active Ingredient(s):____________
3. Are there any differences in the active ingredients found in the
three brands of tablets? If (yes) what are they? (1 mark
communication, 1 mark application)
4. Do the differences in active ingredients affect the results of this
lab? Explain your answer. (1 mark communication, 1 mark
application )
5. Use the following chemical equation to answer questions a-d. (5
marks- knowledge)
CaCO3 + HCl  CaCl2 + H2CO3 + CO2 + H2O
a. List the Reactants:
_________________________________________
b. List the Products:
__________________________________________
c. List the Ionic Compounds (Metal and Non-Metal)
1. _________________
2. _________________
d. List some Molecular Compounds (All Non-Metals)
(Tip Hydrogen is considered a non-metal)
1. _________________
2. _________________
6. Here are the costs per bottle of 150 tablets.
a. Generic Brand
$3.49
b. Rolaids
$4.69
c. Tums
$3.99
Assuming the most expensive brand would be the best and the
cheapest be the least effective, do your results reflect this? Explain
your answer.
(1 mark communication, 1 mark application)
7. Oftentimes the problem of heartburn is caused by stomach acid.
Every year millions of dollars are spent on antacids in North
America to relieve this condition. Small changes in eating habits
can relieve the symptoms of heartburn. In your opinion is the
spending of the millions of dollars on antacids a reasonable
solution or would it be better for people to change their eating
habits? (2 marks communication, 1 mark application)
Lab Mark (5 inquiry marks possible (T/I)- to be evaluated by the teacher.
The Student:
Worked
Stayed on
Worked
Cleaned up Arranged
independently task
safely
Procedure
Cut out the following instructions and arrange in order in the procedure
section. BE sure to arrange first, get teacher to check, THEN PASTE
LAST!
- Make a bar graph to illustrate the results. Put Volume of Acid
Neutralized on the y-axis and the Brand of Antacid on the x-axis.
- Using a glass eyedropper add one drop of NaOH (base) at a time
counting each drop until the solution changes colour permanently.
- Determine the volume of NaOH used to neutralize the remaining acid.
Remember 1 drop = 0.1 ml
- Measure 5 ml of acid and pour it into the small 50 ml beaker. Use a
plastic eyedropper for accuracy.
- Pour the crushed tablet into the acid and stir with a glass stirring rod.
- Add 2 drops of indicator to the acid/antacid mixture and stir
- Answer the questions in complete sentences.
- Crush an antacid tablet using the mortar and pestle.
- Determine the Volume of Acid neutralized by the Antacid by
subtracting the volume of NaOH from the original volume of Acid. See
formula below
Volume of Acid – Volume of Base
Or
5 ml – Volume of Base