Used primarily in analytical chemistry for the detection and quantification of certain metal ions due to its distinct color reactions. It serves as a reagent in qualitative inorganic analysis, particularly in testing for the presence of specific cations. Also finds use in research laboratories for synthesizing coordination compounds and metal-organic frameworks where nickel acts as a central metal ion. Its reactivity with various ligands makes it valuable in studying complex formation and reaction mechanisms in inorganic chemistry. Additionally, it has applications in materials science, such as preparing transition metal compounds for magnetic materials or chemical sensors.