Potassium borohydride (KHBH4) is a white or colorless crystalline solid that is easily soluble in water. It is a strong reducing agent with a wide range of applications in chemical synthesis, analytical chemistry and medicine.The preparation of potassium borohydride is usually obtained by reacting boric acid with hydrogen at high temperatures.

Here are some of the main uses of potassium borohydride:

1. Organic synthesis: Potassium borohydride is used as a mild reducing agent in organic synthesis to reduce organic compounds such as ketones, aldehydes, esters, carboxylic acids, and nitro compounds to corresponding alcohols, alkanes, amines, etc.

2. Analytical chemistry: In analytical chemistry, potassium borohydride can be used to determine the oxidation of certain substances, and the content of the substance is determined by titration.

3. Medicine: Potassium borohydride also has applications in the field of medicine, such as for the production of drugs for the treatment of certain diseases, such as drugs for the treatment of hepatic encephalopathy caused by cirrhosis.

4. Industrial catalysts: Potassium borohydride can be used as an industrial catalyst to catalyze hydrogenation reactions, such as in petroleum refining and petrochemical industry.

5. Chemical Analysis: In chemical analysis, potassium borohydride can be used to detect and quantify certain metal ions, such as mercury ions.