2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21
Alum is called double s alts, which include metals. These are octahedral crystals that have long been used in medicine and industry. The chemical composition includes one of the alkali metals and a trivalent metal. Sulfate crystal hydrates are obtained by combining hot solutions of certain metals, which crystallize into alum when cooled.
Potassium chromium alum: what is it and what is it for
Dark purple octahedral crystals form potassium chromium alum - one of their most common representatives. When the solution is heated, the s alt crystals dehydrate and turn into a light purple powder. The aqueous solution has a sour taste. The name of the crystals comes from the word "kvass", "sour". Depending on the conditions, potassium chromium alum can change color from deep purple to dark green. For example, a black-violet powder changes color to green when heated, and changes to purple when cooled.
It was discovered a long time ago that a tree lowered intoa solution of potassium chromium alum, after drying it exhibits refractory properties. In ancient Greece, potassium chromium alum was known for dressing skins, dyeing wool and cotton fabrics and yarn. Therefore, they are used as a tanning agent in the process of handicraft fur dressing, for the preparation of emulsions and as a tanning fixer. Such properties are determined by their ability to denature the protein.
What is potassium alum
Aluminum-potassium alum is called colorless crystals or their white powder. Easily soluble in water and incompatible with tannins, mercury and lead s alts. When heated, they begin to melt, turn into s alts, and upon further heating, turning into oxides, they release sulfuric acid. Such crystalline hydrates have found use in the preparation of sulfuric acid.
Potassium alum in medicine
Potassium alum has also been widely used in medicine for a long time. They exhibit a hemostatic effect for various wounds and cuts. The fact of their use by ancient alchemists and pharmacists in Europe and Asia to stop bleeding is known. Now they produce a product in the form of an alum pencil, which has a hemostatic, drying and antiseptic effect. Potassium alum is also used in the treatment of varicose veins.
Where to buy alum
Chromopotassium alum is especially popular in the textile industry, so there are many manufacturers of the substance. The choice is great. The Internet offers many businesses,who produce potassium chromium alum, where you can buy them quickly and easily today. You can also choose the packaging and type of alum packaging. Crystal manufacturers where you can buy them are as follows:
− Vitakhim, Yekaterinburg.
− AquaChem, Moscow, st. Voroshilov, 40.
− Yugreaktiv, Rostov-on-Don.
− Cryochem, St. Petersburg.
− Promkhimperm, Perm.
− "Component-reactive", Moscow.
− "UfaKhimProekt", Ufa.
In these companies, as well as in online stores, you can buy potassium chromium alum, the price of which depends on their quantity and manufacturer. One kilogram of alum can be purchased at a price of 450-550 rubles.
Storage conditions
The substance can be purchased in quantities from 200 g to 25 kg, packaged in plastic bags or bags, as well as kraft bags. Sometimes alum is packaged in jars with dark glass. Retail customers purchase crystals in 1 kg packages for leather and textile production. The substance, due to its characteristics, should be stored in dry conditions in a well-ventilated area in cellophane or paper bags. If you do not comply with these simple conditions, then alum weathers and loses its useful properties. Potassium chromium alum is stored for up to 2 years. They are also offered in the form of a deodorant or an alum pencil, they are bought in pharmacies in any city or throughinternet.
How crystals appear
Potassium chromium alum powder is colored dark purple, and its solution has a dark green color. Powder, water and thread are placed in a glass. The container with a solution of the substance is painted black, through which its contents are not visible. The solution contains a seed with a substance, which is placed in a beaker for growing single crystals. Crystals appear due to the precipitate that precipitates in solution. Colorless potassium alum is also used for crystal growth. Interesting shades are given by a mixture of potassium chromium and aluminum alum from lilac and pink to purple.
Using a substance
Croma-potassium and aluminum-potassium alum in the modern world have found the following use:
- as a tanning agent for hides;
− when dressing fur;
− in making a photo;
− as a dye for ceramics;
− in medicine as a hemostatic, anti-inflammatory and astringent;
− in deodorant, antiperspirant and aftershave products;
− in the textile industry as a mordant.
They are useful during water purification and as a disinfectant for the food industry. Potassium alum and potassium chromium alum have found their place in industry and medicine today. But still, aluminum-potassium remains more common. Many companies now provide onlineready-made potassium chromium alum in stores and directly at the company, where you can buy them at any time.
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