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Using indigestion tablets to neutralise an acid

Description

Indigestion is caused by excess acid in the stomach. Indigestion tablets neutralise some of this acid. This experiment shows how you can measure the amount of hydrochloric acid neutralised by one tablet. This is one measure of the effectiveness of the tablet.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
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Apparatus Chemicals

Eye protection

Each working group requires:

Burette (30 cm3 or 50 cm3 capacity) (Note 1)

Conical flask (100 cm3)

Beaker (100 cm3)

Pestle and mortar

Stirring rod

Spatula

Filter funnel, small - about 35 mm diameter

White tile (optional)

Burette stand and clamp

Each working group requires:

Dilute hydrochloric acid of appropriate concentration, 100 cm3(Note 1)

Two indigestion tablets, one of the same brand to be tested by all groups, and another tablet from a range of brands available to the class (Note 2)

Original packets from which the tablets are taken, together with price information for each packet

Methyl orange indicator solution (or alternative)

Deionised or distilled water, about 100 cm3

Refer to Health & Safety and Technical notes section below for additional information.

 







 


Indigestion is caused by excess acid in the stomach. Indigestion tablets neutralise some of this acid. This experiment shows how you can measure the amount of hydrochloric acid neutralised by one tablet. This is one measure of the effectiveness of the tablet.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.

The experiment is also part of the Royal Society of Chemistry's Continuing Professional Development course: Chemistry for non-specialists