Sodium carbonate standard solution (0.1 mol/L in water) used as a titrant in acid-base titrations to standardize and determine the concentration of acids, such as hydrochloric acid or sulfuric acid. Prepared from high-purity and stable sodium carbonate, it serves as a reliable standard for accurate and reproducible results in volumetric analysis. The solution reacts with acids in titration processes, often using indicators like methyl orange to detect the endpoint. Commonly employed in laboratories for standardizing acid solutions. Also utilized in water quality testing to assess acidity and alkalinity. Suitable for educational, industrial, and research applications requiring precise concentration measurements.