Sodium borohydride of the basic introduction

Boron sodium salt is an inorganic chemical formula NaBH4, to off-white fine particle powder or white powder, strong hygroscopicity, its aqueous solution is yellow, and it is the most commonly used reducing agent. , Amines. Easily salted, finely packaged, and tetrahydrogen scattered. It does not belong to the second air, air, air, stable in the air, stable in the air, in the middle zone, it also belongs to the heating at 50 ℃.Symptoms such as sore throat, breathing, shortness of breath, headache, abdominal pain, dizziness, eye congestion, pain and other symptoms after contact with boron blunt. Membrane or skin contact should be disgusting to the human body.

The product usually uses oak, rubber, and chlorine-containing reducing agents, adsorbents in the plastics industry, expansion agents, and double hydrogen chain catalysts for the pharmaceutical industry. Should be carried out carefully in a ventilated room. It should be carried in a cool, dry warehouse, away from heat sources, fire, and cargo. Do not store or transport it with inorganic acids.

Physical properties White crystalline powder, strong hygroscopicity, easy to deliquesce by absorbing water. Soluble in water, liquid ammonia and amines. Easily soluble in methanol, slightly soluble in ethanol and tetrahydrofuran. Insoluble in ether, benzene, hydrocarbons. It is stable in dry air, decomposes in humid air, and also decomposes when heated to 500°C. 

 1. Since the hydrogen in sodium borohydride has a partial negative charge (the electronegativity of B is smaller than that of H), the hydrogen in -OH, -NH-, and -NH2 in alcohols and amines all have more partial positive charges.

 Electric charge, so the BH4- in sodium borohydride can form a double hydrogen bond with the molecules that make up these substances, so sodium borohydride can be dissolved in water, liquid ammonia, alcohols and amines. 

2. Sodium borohydride will react slowly with water and alcohol and other substances containing hydroxyl to release hydrogen. At the same time, because the reaction is slow, the loss of sodium borohydride in a short period of time is small, so sodium borohydride can be alkaline. Solution, methanol, ethanol are used as solvents. NaBH4+2H2O=NaBO2+4H2↑ NaBH4+4HO-R→B(OR)3 +4H2↑+NaOR