Potassium hydroxide
Potassium hydroxide (KOH) is a strong alkaline compound used in chemical synthesis, pH regulation, and industrial processes. It is highly corrosive and commonly employed in the production of soaps, fertilisers, and batteries.
Potassium hydroxide: Properties and Applications
What is potassium hydroxide?
Potassium hydroxide (KOH) is an inorganic compound with the chemical formula KOH. It appears as a white, hygroscopic solid that readily dissolves in water, releasing significant heat. As a strong base, it is used to adjust pH in laboratory and industrial settings. It is also known as caustic potash and is widely used in the manufacture of potassium salts, detergents, and alkaline batteries. Its high solubility and reactivity make it valuable in chemical synthesis and as a catalyst in various reactions.
How is potassium hydroxide used in industry and research?
In industry, KOH is essential in the production of potassium carbonate, potassium phosphate, and potassium soaps. It is also used in the refining of vegetable oils and in the manufacture of biodiesel. In research, it serves as a reagent in organic synthesis, particularly in the hydrolysis of esters and saponification reactions. In biological and biochemical applications, it is used to maintain alkaline conditions in buffer solutions, such as in the preparation of certain cell lysis buffers. Additionally, it is employed in the calibration of pH meters and in the production of electrolytes for fuel cells.
What safety and regulatory considerations apply?
Due to its corrosive nature, potassium hydroxide requires careful handling. It can cause severe skin and eye burns and must be stored in airtight containers to prevent moisture absorption. Safety data sheets (SDS) and compliance with regulations such as REACH, GHS, and ISO standards are essential. It is classified under the European Union’s CLP regulation as a corrosive substance (H290). Proper personal protective equipment (PPE), including gloves and eye protection, is mandatory when handling KOH.
Related concepts
Commonly used alongside KOH are other strong bases such as sodium hydroxide (NaOH), and buffer systems like Tris and HEPES. It is also relevant in the context of pH control, electrolyte formulation, and chemical safety protocols.