Rhodizonic acid sodium salt is primarily used in analytical chemistry as a sensitive reagent for detecting and identifying various metal ions. It is particularly effective in the qualitative analysis of barium, strontium, and calcium ions, forming distinct colored complexes that aid in their identification. In addition, it serves as a chelating agent in research applications, helping to study the behavior and interactions of metal ions in different chemical environments. Its ability to produce vivid color changes makes it a valuable tool in educational laboratories for demonstrating chemical reactions and principles. Furthermore, it finds use in specialized organic synthesis processes where its unique properties facilitate specific reactions.