Boric acid 500 g

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Formula: H₃BO₃

Molar mass: 61.83 g/mol

Melting point: 170.9 °C

Density: 1.44 g/cm³

Solvent: Water

IUPAC ID: Trihydroxyboron, Boric acid

In goldsmithing, it is used in combination with denatured alcohol as a means to protect the surface from oxidation and the formation of colored stains during hardening and soldering.

In galvanization, it is used in some special galvanic baths, for example in the ratio H₃BO₃:NiSO₄ = 1:10 with a very small addition of sodium lauryl sulfate and H₂SO₄.

Boric acid is very soluble in water when mixed with borax (sodium tetraborate decahydrate) in a ratio of 4:5, although each compound is not soluble on its own. The solution is used for wood impregnation against burning.

In a mixture with finely powdered quartz sand, it is used for coatings in induction furnaces and in the production of ceramics.

Boric acid is one of the most common substances for neutralizing hydrofluoric acid. It works by binding free F^- ions into complex salts. This process eliminates the extreme toxicity of hydrofluoric acid, especially its ability to sequester calcium ions from blood serum, which can lead to cardiac arrest and bone degradation. This can occur even with minor skin contact with hydrofluoric acid.

In blacksmithing, boric acid is added to borax as a flux in welding.

Boric acid, in combination with eight other chemicals, is used for hydraulic fracturing of oil shale.