Chloranilic Acid Sodium Salt Hydrate is primarily used in analytical chemistry as a reagent for the determination of various metal ions. It forms colored complexes with metals like calcium, magnesium, and barium, making it useful in spectrophotometric analysis. Additionally, it serves as a pH indicator in certain chemical reactions due to its ability to change color in response to pH variations. In organic synthesis, it acts as a catalyst or intermediate in the preparation of specific compounds. Its role in dye and pigment industries is also notable, where it contributes to the production of colorants. Furthermore, it is employed in research laboratories for studying redox reactions and electrochemical processes.