Used for detecting and measuring the presence of certain cations in qualitative inorganic analysis, particularly in the identification of metal ions such as iron, aluminum, and copper. It helps in forming characteristic precipitates or color changes when added to test solutions. Commonly used in laboratory settings for educational experiments and analytical chemistry to distinguish between different metal salts based on their solubility and complex formation behavior in basic conditions. Also employed in field testing kits for water quality analysis to check for metal contaminants.