Used as a sensitive analytical reagent for the detection of potassium ions in solution. It forms a characteristic deep blue precipitate, known as Prussian blue, when it reacts with ferric iron in the presence of potassium, making it valuable in qualitative inorganic analysis. Also employed in the preparation of electrochemical sensors due to its redox activity. Its ability to undergo reversible electron transfer makes it suitable for research in biosensors and catalytic systems. Additionally, it serves as a precursor in the synthesis of coordination polymers and metal-organic frameworks with potential applications in ion exchange and gas storage.