Calcium carbonate is often classified as a base, but it’s more accurate to say it possesses basic properties. When dissolved in water, calcium carbonate dissociates into calcium ions and carbonate ions. The carbonate ions can react with acids to form bicarbonate and carbon dioxide, demonstrating their ability to neutralize acids.
In terms of pH, calcium carbonate solutions can be slightly basic, generally having a pH above 7. However, it’s important to note that calcium carbonate itself is not a strong base like sodium hydroxide or potassium hydroxide. Instead, it acts as a mild base that can partially neutralize acids, making it useful in applications like antacids and agricultural lime.