Carbonic acid is a weak acid formed when carbon dioxide dissolves in water. Its chemical formula is H₂CO₃. This acid plays a crucial role in maintaining the pH balance in natural waters and is involved in the process of photosynthesis in plants. In everyday life, carbonic acid is found in carbonated beverages, giving them their fizz. When you open a soda, the pressure is released, allowing the dissolved carbon dioxide to escape, which forms bubbles. Although it is weak, carbonic acid can contribute to the acidity of rainwater and affect the environment, particularly in ocean chemistry.