1. what is barium sulfate
Barium sulfate, also known as barite, is a natural ore, the general shape of the crystal block, the color is mainly determined by the type of impurities and how much it contains, pure barite is colorless and transparent. Barium sulfate powder is people select natural barium sulfate ore (barite) after cleaning, polishing, drying and other processes, its impurities are more, the quality is mainly determined by the mine itself, but its price is low, usually used in white pigment production or low-grade paint, plastic, ink industry as a filler. Precipitated barium sulfate in industry mainly through the reaction of barium sulfate and sulfuric acid, barium chloride and sulfuric acid or sodium sulfate reaction, mainly used in high-grade coating ink, plastic, rubber, glass, ceramics and other fields as a filler.
2. what is barium sulfite
Barium sulfite, white equiaxed cubic crystal, sometimes light gray or yellow-green, industrial products are light brown or black powder. Mainly used in the manufacture of barium salt, lithopone and luminescent paint, also used as rubber vulcanizing agent and leather depilatory agent. Also used in papermaking. When identifying sulfite and sulfate, barium nitrate solution acidified by dilute nitric acid cannot be used for testing, because hydrogen ions and nitrate ions meet with strong oxidation, easy to oxidize sulfite into sulfate. Barium chloride solution should be added separately to produce precipitate, dilute hydrochloric acid should be added, the precipitate is partially dissolved, irritating gas should be smelled, magenta solution should be introduced, the solution should fade, then heating should be carried out, and the color of the solution should be restored, then the original substance is barium sulfite.
3. barium sulfate and barium sulfite the same?
Barium sulfate is insoluble in water and acid; barium sulfite is insoluble in water, but soluble in acid, such as hydrochloric acid and sulfuric acid. If your barium salt is barium nitrate, when you add acid, hydrogen ions and nitrate ions are combined into nitric acid, and nitric acid has strong oxidation to oxidize barium sulfite to barium sulfate.
4. use chemical methods to identify barium sulfate and barium sulfite, the following is the chemical reaction formula:
Inspection SO32-: Solids are dissolved with excess hydrochloric acid, and the generated gas is introduced into the magenta test solution. If the magenta fades, the red color will recover after heating. It is proved to contain SO32-2, test Ba2 to take the filtrate in the above reaction, add.H2SO4Solution, if a white precipitate is generated, it is proved to contain Ba2 and SO32-, so it isBaso3。
5. how to identify barium sulfate and barium sulfite?
The white precipitate soluble in acid is easily oxidized to barium sulfate, so when identifying barium sulfite and barium sulfate, barium nitrate solution acidified by dilute nitric acid should not be used, but barium nitrate solution acidified by dilute hydrochloric acid should be used to generate barium sulfate, while barium sulfite is not precipitated.
In the identification of barium sulfite and barium sulfate, it is not possible to test with barium nitrate solution acidified by dilute hydrochloric acid. Because of the strong oxidation of hydrogen ions and nitrate ions, it is easy to oxidize barium sulfite into barium sulfate. Barium chloride solution should be added separately to produce precipitation, dilute hydrochloric acid should be added to smell irritating gas, and then clear lime water should be used to test the gas.
In this way, when we buy precipitated barium sulfate or natural barium sulfate, we can distinguish the quality of the product.