Buy Potassium dichromate | Potassium dichromate

Buy Potassium dichromate | Potassium dichromate


  • CAS Number: 7778-50-9
  • Appearance: Solid
  • Purity:99.84%
  • Made in: China 
  • Phone Num : +86-2150591759    
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Potassium dichromate or Potassium bichromate is a salt of chromic acid or green chromium oxide with the chemical formula Cr2K2O7. This chemical and inorganic compound is seen in the form of bright reddish-orange crystals. This substance is a strong oxidizer and is used in various industries.

appearance of potassium dichromate


Physical and Chemical Properties:

Potassium dichromate is an inorganic compound with K2Cr2O7 chemical formula is a red-orange colored crystalline solid Which emits toxic chromium vapor when heated. It is highly corrosive and commonly used as an oxidizing agent, an allergen, and a sensitizer in industry and laboratories. Potassium dichromate is a potassium salt of dichromic acid. Generally, this material is used as a wood preservative, pigment production, and also in the photomechanical processes. The best alternative to potassium dichromate is sodium dichromate.

The most important physical and chemical properties of this compound can be summarized in the following table:

Chemical formula K2Cr2O7
Molecular Weight(g/mol) 294.185
Appearance solid
odor odorless
taste Bitter, metallic taste
pH (1% aqueous solution) 4.04
Density (g/cm3 at 77 °F) 2.676
Melting point (° C) 398 (748 °F; 671 K)
Boiling point (° C) 500 (932 °F; 773 K)
Water Solubility (g/100 cc at 100 °C) 102
Solubility insoluble in alcohol, acetone
Other names Potassium bichromate, Kaliumdichromat, Dipotassium bichromate
color Orange-red
form crystalline

Formula and Structure of Potassium Dichromate:

The chemical formula of potassium dichromate is K2Cr2O7 and its molar mass is 294.185 g / mol. It is an ionic compound with two negatively charged potassium ions (K) and a negatively charged dichromate ion (Cr2O7) in which two hexagonal chromium atoms (with an oxidation state of 6) are each attached to three oxygen atoms and one oxygen bridge atom.

chemical structure of potassium dichromate

Production Process of Potassium Dichromate:

Potassium dichromate is produced industrially by the reaction of potassium chloride (KCl) with sodium dichromate (Na2Cr2O7) followed by cooling and evaporative crystallization.

                                            Na2Cr2O7 + 2KCl → K2Cr2O7 + 2NaCl

Dichromate salts are also produced by the reaction of potassium chromate with acids or bases.

It can be obtained from roasting chromite ore with potassium hydroxide from potassium chromate.

Reactions of Potassium Dichromate:

  • By heating this compound, the product is decomposed into potassium chromate, chromium oxide, and oxygen.

                                            4K2Cr2O7 → 4K2CrO4 + 2CrO3 + 3O2

  • This chemical, which is a strong oxidizer, can easily oxidize iodide to iodine.

                                    Cr2O72- + 14H + + 6I– → 2Cr3 + + 7H2O + 3I2

Applications and Uses of Potassium Dichromate:

potassium is used for a wide range of biological functions in the human body, but the chemical composition of this substance is quite the opposite and is very harmful to human health.

Potassium dichromate is very corrosive and is a very strong oxidant and this property is used in various applications.

  • This chemical compound is commonly used as an inorganic chemical reagent for industrial and laboratory processes.
  • Used in mud drilling, wood preservatives, cement, and as a corrosion inhibitor for metals.

use of Potassium dichromate as a wood preservatives

  • It is used to make strong cleaning solutions for laboratory glassware and cast iron.
  • This chemical is used to produce products such as shoe wax and adhesives to produce pigments and photochemical processes.
  • This chemical is also used in the galvanizing process in the cooling tank.

Safety Information:

  • It primarily affects the respiratory system and causes ulcers, shortness of breath, bronchitis, pneumonia, and asthma, but can also affect the gastrointestinal tract, liver, kidneys, and immune system.
  • It is known to be a highly carcinogenic compound for humans and increases the risk of lung cancer and sinus cancer.
  • In the case of skin contact, it causes severe irritation and burning sensation and may even lead to blindness.
  • Researchers have also found that it can affect reproductive health and act as a mutagenic agent in the sense that it affects genetics and harms immature children.

First-aid measures:

Skin Contact: Immediately flush skin with water.

Inhalation: move the person to the fresh air.

Eye Contact: Rinse eyes with water for at least 15-20 minutes.

Ingestion: Do not induce vomiting. Get medical aid immediately. Call a poison control center.

Avoid exposure to heat, sparks, open flames, and contact with hot objects.

Use personal protective equipment if necessary.

Packing and Storage:

The material should be stored in a tightly closed container in a cool, dry, well-ventilated area away from reducing agents.

This material is stable under normal temperature and pressure, but do not store this compound with reducing agents under any circumstances, as this product is a strong oxidizer. A strong oxidizer is a compound that can increase the combustible nature of other materials by using oxygen. As a result, if this material is stored with reducing agents or other incompatible compounds, the risk of explosion and fire by this material will be very high.


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