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The materials required for this science fair project:
- 4 beakers
- 800ml water
- 80ml hydrochloric acid
- 4 brands of antacid – Milk of Magnesia, Gaviscon, Turns, Tagamet
- 1 pH meter
- 1 burette
- 1 bowl and pistle
- 1 glass stirrer
- 1 measuring spoon
- 1 marker pen


1. For this experiment, the independent variable is the brand of antacid. The dependent variable is the amount of acid needed to neutralize the antacid. This is determined by measuring the amount of acid dropped from the burette, and by using a pH meter. The constants (control variables) are the concentration of acid solution and the amount of water in the beaker.

2. The 4 beakers are filled with 200ml of water each. Using the marker pen, the 4 beakers are labeled Magnesia, Gaviscon, Turns and Tagamet.

3. The recommended dosages of the 4 types of antacids are mixed together with the water in their respective beakers, named according to the brands. The tablet form of antacid is crushed first using the bowl and pistle before mixing it with water. The liquid form of the antacid is dispensed using a measuring spoon.

4.  40ml of hydrochloric acid is poured into the burette.

5. The burette is placed over the beaker labeled Milk of Magnesia. The acid in the burette is inserted, drop by drop into the beaker. With every drop, the solution is mixed, using the stirrer and the pH reading is taken, until it reaches 7.0. The amount of acid required to neutralize the solution in the beaker is recorded in the table below.

6. The burette  is refilled with  hydrochloric acid until 40ml again for the next test.

7. Procedures 5 and 6 are again repeated for the beakers labeled Gaviscon, Turns and Tagamet.

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 hour for the science project experiment
Material availability:
Access to a school's science laboratory is required
Safety concerns:

Safety gear/gloves need to be worn at all times when handling acids and other chemical substances