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http://www.education.com/science-fair/article/antacid-potentcy/
Which antacids are most potent in neutralizing lemon juice?

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How do antiacids work?What are antacids are used for
Acids help in breaking down the food you eat. Though the body has some natural defense mechanisms against acidity at times these do notwork. At these times you may experience a burning sensation sometimes in your throat or esophagus.
Your throat, unlike your stomach, was never designed to handle thisacid. When the valve between your stomach and esophagus opens prematurely, some acid enters your throat and you get that burning feeling known as heartburn. While youhave heartburn you may experience a burning pain in your chest or behind your sternum – just below where your neck ends.
Acids help in breaking down the food youeat.
How antacids work
Antacids are medicines that help correct the pH balance in your stomach. Your stomach has its own natural acids and sometimes these acids becometoo much for your stomach to handle. This is caused when you don’t eat on time and you have an empty stomach. What the antacid does is to neutralize this affect. Theybuffer the stomach’s gastric acid since they are basic in nature. Some antacids are designed to ensure that your stomach doesn’t become too base in nature. Which isthe very opposite of being acidic!
Types of antacids
Antacids are made up of different kind of chemicals. Some of the common ones include aluminum hydroxide, magnesiumhydroxide, calcium carbonate and sodium bicarbonate. Though most of these chemicals are used individually, you may find them used in combinations.

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