What Are the Different Uses of Sulfuric Acid?
Sulfuric acid (chemical formula: H 2 SO 4 ), the most important oxygen-containing acid of sulfur. Anhydrous sulfuric acid is a colorless oily liquid that crystallizes at 10.36 ° C. It is usually used in various concentrations of its aqueous solution and prepared by the tower method and the contact method. The former is crude dilute sulfuric acid with a mass fraction of about 75%; the latter gives 98.3% concentrated sulfuric acid with a boiling point of 338 ° C and a relative density of 1.84.
- Sulfuric acid (chemical formula: H 2 SO 4 ),
- In ancient China, dilute sulfuric acid was called "green alum oil". From 650 to 683 AD (during the reign of Emperor Gaozong of the Tang Dynasty), the alchemist Gu Gongzi recorded in his book "Huang Di Jiuding Shen Dan Jing Ju" Vol. ) To obtain sulfuric acid.
- Sulfuric acid was discovered in the 8th century AD. Arab alchemist Jabir obtains sulfuric acid by dry distillation of ferrous sulfate crystals. Some early chemistry researchers, such as Lacy, Jabir, etc., also wrote a classified list of sulfuric acid and related minerals; others, such as Dr. Ibn Sina, paid more attention to the type of sulfuric acid And their value in medicine. [1]
- Is moderately toxic.
- Acute toxicity: LD 50 2140mg / kg (rat oral); LC 50 510mg / m³, 2 hours (rat inhalation); 320mg / m³, 2 hours (mouse inhalation)
- Store in a cool, ventilated warehouse. The storage temperature does not exceed 35 ° C, and the relative humidity does not exceed 85%. Keep container tightly closed. Away from fire and heat sources, smoking is strictly prohibited in the workplace. Keep away from flammable and combustible materials. Prevent vapors from leaking into the workplace air. Avoid contact with reducing agents, alkalis and alkali metals. Handle with care when handling to prevent damage to packaging and containers. Equipped with the corresponding variety and quantity of fire fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues. When diluting or preparing a solution, acid should be added to the water to avoid boil and splash injury to people.