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Boric acid

Boric acid

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Kazakhstan, Almaty
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Technical characteristics
  • Country of manufactureTurkey
  • TypePreservatives
Description

Boric acid (boron hydroxide acid) — the slabayakislota having chemical formula of H3BO3.

Colourless crystal substance in the form of flavourless scales, has layered triclinic lattice in which molecules of acid are connected by hydrogen bonds in flat layers, layers are connected among themselves by intermolecular bonds (d = 0,318 nanometers).

Boric acid shows very weak acid properties. It is a little soluble in water. Its acid properties are caused not by eliminating of proton of H + , but accession of hydroxylic anion.

Metaboric acid (HBO2) also represents colourless crystals. It exists in three modifications — the steadiest γ - HBO2 with cubical lattice, β - HBO2 with monoklinny lattice and α - HBO2 with rhombic lattice.

When heating boron hydroxide acid loses water and at first passes into metaboric acid, then into tetraboric H2B4O7.

At further heating it is dehydrated to boric anhydride.

Aqueous solutions of boric acid are mix of polyboric acids of the general formula N3m - 2nvmo3m - n.

Application:

  • In nuclear reactors as the absorber of neutrons dissolved in the heat carrier.
  • Boric fertilizer.
  • Laboratories apply to preparation of buffer solutions.
  • In medicine — as independent desinfectant, and also in the form of 2% of solution - for washing of skin after hit of alkalis.
  • Also on the basis of boric acid the different combined preparations (ATX D08AD group), for example, Teymurov's paste are made.
  • In the photo — as a part of fine - grained developers and acid fixatives for creation of weak acid condition.
  • In the food industry — it is registered as food additive of E284 (in the territory of Russia this additive is not included into the list allowed for use).
  • In game Novus rub with boric acid game table for the best sliding of counters.
  • In jewelry — as basis of gumboils for the soldering of gold - bearing alloys.
  • In the industry - binding at acid lining of furnaces.
  • In life - extermination of cockroaches.
Characteristics
Country producer Turkey
Additional characteristics
Name of indicators Norm
Appearance: white loose powder
1. Content of the main substance, % , not less 99,6
2. Content of boron oxide, % , not less 56,04 - 56,05
3. Content of sulfates, mg/kg, no more 578 - 590
4. Content of chlorides, mg/kg, no more 370 - 380
5. Content of calcium, mg/kg, no more 101 - 102
6. Content of iron, mg/kg, no more 15 - 17
7. Content of sodium, mg/kg, no more 90 - 91
8. Content of magnesium, mg/kg, no more 45 - 47
9. Content of insoluble substances, % , no more 0,07 - 0,09
10. Water content, % , no more 0,16 - 0,18
11. Bulk weight, g/cm3 0,80
Packaging: bag of 25 kg
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