Sulfosalicylic acid -

Sulfosalicylic acid

Sulfosalicylic acid is an organic compound that refers to aromatic sulfonic acids. Under normal conditions occurs in the form of a crystalline powder of white color. The crystals are acicular, without color. In some cases, the powder may acquire a pink tinge, indicating a small amount of iron in the acid. It easily dissolves in water, as well as in all organic solvents - for example, in ethyl alcohol. Does not dissolve in chloroform and benzene.

Main properties:

  • If the sulfosalicylic acid is heated, it will turn into salicylic acid. Also, phenol is released.
  • In the reactions involved as elements of the aromatic ring, which contains the acid, and functional groups. So, it interacts with most metals, especially actively - with iron and its derivatives;
  • Precipitates proteins and easily detects them in solutions, even if the protein content is a thousandth of a percent;
  • The melting point depends on how fresh the acid is. If it has just been dried, it is necessary to heat it to 180 degrees, and if kept in the air for a while, 110 degrees is enough.



Sulfosalicylic acid is widely used in analytical chemistry: it can easily detect metal ions and separate them. For example, thanks to it, it became possible to remove iron ions from products whose properties change due to the impurities of this metal. Because of the ability to identify proteins, the acid is used in medicine: it helps to detect them in physiological fluids. It also serves to determine the level of nitrates in water and is a good antiseptic. Sulfosalicylic acid was also found in the chemical industry: it is necessary for organic synthesis.


If sulfosalicylic acid is in a solid state, it does not adversely affect either the human body or the environment. But in the form of a solution, it is dangerous: getting on the skin or mucous, the acid causes inflammation and irritation. In addition, it is fraught with the emergence of diseases of the respiratory system. Work with sulfosalicylic acid in this case can be only in a protective suit, respirator and glasses, and the laboratory should be equipped with a good ventilation system.


Sulfosalicylic acid is exposed to direct sunlight, so it can be transported by any transport, but only if it is covered. In this case, pack acid in a sealed container. Non-transparent plastic bags are most often used for this purpose.


So that sulfosalicylic acid does not lose its properties, it must be stored in a closed storage room. It must be dry and well ventilated.

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