Indigestion

== Stomach acid== Our stomachs produce hydrochloric acid. The acid is used to: Sometimes our stomachs produce too much acid. This causes pain that we call indigestion.
 * kill bacteria in our food
 * help digestion, as some of the enzymes that break down our food into simpler substances only work in acidic conditions

Neutralisation
Indigestion remedies contain antacids that neutralise excess stomach acid. Neutral liquids are neither acid nor alkaline.

Antacids contain substances called bases. Bases react with acids and neutralise them. Some bases are soluble. A base dissolved in water is called an alkali

acid + base = salt + water