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Acid oxalic – Ekspohim, ChP | all.biz
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Acid oxalic

Acid oxalic

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Description

Oxalic acids:
represents colourless monoklinny hygroscopic crystals, easily soluble in water, it is limited - in ethyl alcohol and ethyl oxide, insoluble in chloroform, petroleum air and benzene.


Oxalic acid is bibasic saturated carbonic acid. Belongs to strong organic acids. Has all chemical properties characteristic of carbonic acids. Salts and air of oxalic acid are called oxalates. Oxalic acid forms sour and average air, amides, chloranhydride.
In the nature contains in a sorrel, a rhubarb and some other plants in a free look and in the form of oxalates of potassium and calcium.
Density is 1,36 g/cm ³. Melting temperature - 189,5 °C, sublimation temperature - 125 °C, decomposition temperature - 100-130 °C, decarboxylation temperature - 166-180 °C.

Chemical formula: C2H2O4

Use of oxalic acid.

  • in chemical industry (organic synthesis, by production of plastic, ink, in synthesis of dyes, as a component of pyrotechnic structures);
  • in chemical metallurgy (as a component of structures for purification of metals of a rust, a scum, oxides); - in analytical chemistry (as a precipitator of rare-earth elements);
  • in microscopy (as bleach of cuts);
  • in the textile and tanning industry (pickle in a sittsepechataniye and when dyeing wool and silk, at a skin tanning);
  • by production of synthetic detergents (as bleaching and disinfectant, means for cleaning and removal of an uric stone, salts of rigidity and a rust);
  • in cosmetics (as active additive in bleaching creams and creams from freckles);
  • in systems of water purification (a chemical way of cleaning and decrease in hardness of water, cleaning of heat carriers on the NPP);
  • in medicine and pharmaceutics.

 

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