Na2HBO3

Na2HBO3, also known as disodium hydrogen borate, is an inorganic salt that forms from boric acid and sodium hydroxide. In its solid state it appears as a white crystalline material and it dissolves readily in water. In solution it contributes borate species and typically exhibits basic properties.

Preparation and forms

Na2HBO3 can be prepared by neutralizing boric acid with sodium hydroxide in a 2:1 molar ratio:

H3BO3 + 2 NaOH → Na2HBO3 + 2 H2O.

The compound can exist as an anhydrous salt or in hydrated forms depending on the processing conditions and the presence of water.

Structure and properties

The salt comprises the HBO3 moiety balanced by two sodium cations. In aqueous solution it acts as a borate source and contributes to buffering in the borate system. It is stable under ordinary laboratory conditions but may decompose at high temperatures to form boron- and sodium-containing oxides, with water loss.

Applications

Na2HBO3 is used as a laboratory reagent and as a boron source in chemical synthesis. It can serve as a component in buffering systems and as a flux or precursor in materials processing, notably in glass and ceramics applications where borates are employed to modify melting behavior and properties.

Safety considerations

Handling Na2HBO3 should follow standard safety practices for inorganic salts. It can be irritating to skin and eyes and may be harmful if ingested or inhaled in large amounts. It should be stored in a cool, dry place and kept away from incompatible substances. It is also advisable to prevent environmental release and to dispose of it according to local regulations.