Basic Information

Physical and chemical properties

Physical property

Bydric acid is colorless transparent crystals or powder. The crystal structure has two forms, namely α (diamond) and β -type (single -dialect), without sniffing and taste acid. The melting point is α, 189.5 ℃, β type: 182 ℃. The boiling point is 150 ° C (sublimated). The refractive index is 1.540.

It is easy to dissolve in ethanol, soluble in water, slightly soluble in ether, and insoluble in benzene and chlorine.

Chemistry property

Acidity

The acidic acid is more acidic than acetic acid, which can decompose sodium carbonate (NA2CO3). The first-level ionization constant of Berbin acid is 5.6 × 10-2, and the secondary ionization constant is 1.5 × 10-4.

Instability

At 189.5 °C or in the encounter, it will decompose carbon dioxide, carbon monoxide and water.

H2C2O4 = CO2 ↑+CO ↑+H2O

The laboratory can use this reaction to make carbon monoxide gas.

At 200 degrees of ammonium oxalate, it is broken down into carbon dioxide, carbon monoxide, ammonia and water

Restoration

Berbinic acid has a strong reduction and can be oxidized to CO2 by oxidant. Byrite can fade KMNO4. This reaction can be used to tit the KMNO4 concentration and can be washed away ink traces splashed on the cloth strip.

Esterization response

Both diic acid can generate ester with alcohol reactions. For example, a dyshayal acid and ethanol reaction generate ethyl acetate

toxicity

Poisonous oxalic acid, stimulating and corrosive effects on the skin and mucous membranes. It is easy to cause poisoning through epidermal and mucous membrane absorption. The maximum allowable concentration in the air is 1 mg/m3.

use

As a bleach

Ocxolic acid is mainly used as a reducing agent and a bleach, and is used to produce drugs such as antibiotics and borneols, as well as solvents, dye reducing agents, and tannasters of rare metals.

Ocaxal acid can also be used for production of cobalt-molybdenum-aluminum catalysts, cleaning metal and marble, and bleaching textiles.

For metal surface cleaning and treatment, rare earth element extraction, textile printing and dyeing, leather processing, catalyst preparation, etc.

Renewal

In the organic synthetic industry, it is mainly used to produce chemical products such as phenylphenol, ductiol, cobaltic acid cobalt, nickel nickel, and non -menic acid.

The plastic industry is used to produce polyvinyl chloride, amino plastic, teloamaldehyde plastic, paint tablets, etc.

The dye industry is used to manufacture salt base green.

The printing and dyeing industry can replace the acetic acid, which is used as a color -dye dye and bleaching agent for pigment dyes.

In addition, oxalic acid can also be used to synthesize products such as a variety of oxalic acid esters, oxalate, and heroxide, and the output of vitroxoltate, sodium oxalate, and calcium oxalate.

Media dye

Ocstaria can be used as a media dye, and ammonium oxalate is a pharmaceutical printed blueprint.

Rust removal function

Ocaxone can be used to remove rust: buy a bottle of oxalic acid in a store selling chemical reagents, take some, use warm water to match the solution, and apply it to rust stains. Then wipe it with gold -phase sandpaper, and then spray the paint. There are generally some equipment and glass instruments in the shops selling oxalic acid.

Precautions:

Be careful when using, oxalic acid has strong corrosiveness on stainless steel. Houxalic acid with high concentration is also easy to corrode. And the generated acid -type oxalic acid has a large degree of solubility, but it has certain toxicity. Do not eat it when used. After the skin is exposed to oxalic acid, it should be washed with water in time.