Carbonic acid (CO2) is a chemical compound consisting of carbon and oxygen. It is formed by combining carbon dioxide (CO2) with water (H2O) and forms a weak acid. Carbonic acid is also what makes carbonated drinks such as lemonade, mineral water or soda water fizzy.
Carbonic acid is important in water analysis because it affects the pH value of water. When carbon dioxide is dissolved in water, it reacts with water to form carbonic acid, which lowers the pH value. A higher concentration of carbon dioxide in water leads to a lower pH value and thus to more acidic water.
Free carbonic acid plays a central role in the softening and deacidification of water. It influences the carbonate hardness and the balance between dissolved CO₂, hydrogen carbonate and carbonate. The correct setting is important for the stability of the water (prevention of limescale deposits or corrosion).
Duroval CO₂ Test Kit by Heyl – CO₂ Measurement Made Easy Quick Determination of Dissolved CO₂ The Duroval CO₂ test kit is designed for determining dissolved carbon dioxide in water samples. With this kit, you can reliably measure free carbonic acid in water using drop titration. Quick and Reliable Determination of Dissolved CO₂ in Water The Duroval CO₂ test kit enables precise measurement of dissolved carbon dioxide (free carbonic acid) in water samples. Using the proven drop titration method, CO₂ levels can be determined quickly, easily, and reproducibly. The kit is ideal for applications in water treatment, drinking water monitoring, industry, and technical operations where CO₂ content directly affects water chemistry and material durability. Why Measuring Carbon Dioxide (CO₂) in Water is Important Dissolved carbon dioxide significantly affects the pH, corrosiveness, and chemical stability of water. Excess CO₂ can cause corrosion in pipes, fittings, and system components, especially metallic materials. Additionally, CO₂ plays a key role in the lime-carbonic acid equilibrium. Imbalances can promote both scaling (lime deposits) and material degradation. Regular measurement of free CO₂ allows for targeted water treatment, optimized dosing, and prevention of system damage. The Duroval CO₂ test kit therefore supports safe process management, stable water quality, and long-term protection of water-carrying systems.