Carbon dioxide acidity

Carbon dioxide acidity

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Carbonic acid (H2CO3) turning universal indicator yellow as carbon dioxide (CO2) gas dissolves in water (H2O), forming the acid. Universal indicator is an analytical chemical that shows where acids or alkalis lie on the pH scale. This yellow colour indicates an acidic pH of around pH 5-6, a weak acid. All rainwater is slightly acidic in this way, and carbonic acid is a natural acid that erodes rocks such as limestone. The equation for the reaction is: CO2 + H2O ----> H2CO3.

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Keywords: acid, acidic, acids, analysis, analytical, carbon dioxide, chemical, chemicals, chemistry, detect, detection, gas, gaseous, jar, ph scale, rain, range, solution, test, testing, universal indicator

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