GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Carbonic acid formation, 2 of 3. Carbon dioxide (CO2) gas is bubbled through water that has universal indicator added. Initially the water is green, indicating a neutral solution. As some carbon dioxide is dissolved in the water, weak carbonic acid (H2CO3) is formed and the colour of the solution turns yellow, indicating a weakly acidic solution. The reaction is CO2 + H2O -> H2CO3.
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