Sodium borohydride, with the chemical formula NaBH4, is an inorganic compound used as a reducing agent in various industrial and laboratory processes. It is a white to grayish crystalline powder that is soluble in water and lower alcohols, and slowly decomposes at about 400°C. Here are some key points about sodium borohydride:

• Properties: Sodium borohydride is a white to grayish crystalline powder, soluble in water and lower alcohols, and slowly decomposes at about 400°C.
• Uses: It is commonly used as a reducing agent in organic and pharmaceutical synthesis, wastewater treatment, and paper pulp bleaching.
• Preparation: It can be prepared on an industrial scale by treating trimethyl borate with sodium hydride or by reacting borax, metallic sodium, dihydrogen, and silicon dioxide.
• Safety: Sodium borohydride is a hazardous substance and should be handled with care. It reacts violently with water and can liberate flammable hydrogen gas. It can cause burns to the skin, eyes, and respiratory tract.

Sodium borohydride is widely used in various chemical processes due to its stable performance and selective reduction capabilities. However, it should be handled with caution due to its hazardous properties.