World English Dictionary
carbonic acid
 
n
a weak acid formed when carbon dioxide combines with water: obtained only in aqueous solutions, never in the pure state. Formula: H2CO3

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
carbonic acid   (kär-bŏn'ĭk)  Pronunciation Key 
A weak, unstable acid present in solutions of carbon dioxide in water. It gives carbonated beverages their sharp taste. Chemical formula: H2CO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Carbonic acid is especially effective at dissolving limestone.
Dissolved in the ocean, it forms carbonic acid which dissolved the calcium
  shells of oxygen producing phytoplankton.
When sodium hydroxide combines with carbonic acid, they create sodium carbonate.
Rainwater is acidic due mainly to the presence of carbonic acid-a common
  culprit for lowering the pH of water.
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