Chemicals that remove the excess of acid from stomach and maintain ph to normal level are antacids ex : omeprozoel, lansoprozole 

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Antacids are the substances that neutralise stomach acidity. Excessive secretion of acid for digestion in our stomach is fatal and can cause many diseases. So to neutralise it we use antacids.One well known antacid is Milk of Magnesia chemically known as magnesium Hydroxide. Second Example is Andrews Antacid. This is a type of Neutralisation Reaction.
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