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Boric acid It is derived from the action of natural borax (sodium borate) and acid. The chemical formula is H3BO3. The molecular weight is 61.83. White triclinic scales with shiny crystals. The relative density is 1.43514, and the refractive index is 1.337, 1.461, and 1.462. It is soluble in water, ethanol and glycerin. The aqueous solution is acidic, a weak monobasic acid (Ka=6×10-10). The solubility in water increases with increasing temperature. Heat to 1Chemicalbook 69°C (±1°C) for dehydration to generate metaboric acid, and 300°C to generate boric anhydride. Neutralize with strong base to get metaborate. Tetraborate is obtained under weakly alkaline conditions. Preparation method: It can be prepared by adding or sulfuric acid to borax solution, or by decomposing boronite with . Uses: Widely used in the production of borate, water glass, borate, optical glass, enamel, paint, pigment, cosmetics, food preservatives, leather finishing, printing and dyeing auxiliaries and medicine, etc., and can also be used as antiseptic, disinfectant, and astringent Agent.
It is chemical used for making ceramics, glazes, cements, wicks, food preservatives, special glasses; Also for leather dressing compounds for preparation of hides prior to tanning; Artificial precious stones; As flux in metallurgical industry, fire-proofing compositions and linings for safes; Also for pigments; Enamel paints, paper glazes, cosmetics, soaps, textiles, medicines, etc.
| Item | Index | |
| First grade | Second grade | |
| Boric acid(%) | ≥99.5% | ≥96.5% |
| Water insolubles(%) | ≤0.05% | ≤0.15% |
| Sulfate(SO4)(%) | ≤0.10% | ≤0.40% |
| Chloride(CL)(%) | ≤0.01% | ≤0.05% |
| Iron(Fe)(%) | ≤0.003% | ≤0.005% |
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