Potassium dichromate - physicochemical properties and application

Potassium dichromate is a non-tracing crystal of predominantly orange color (sometimes reddish), which dissolve well in the aquatic environment and resemble the thinnest needles or plates in shape. When interacting with a substance, the aqueous solution acquires an acidic reaction.

Potassium dichromate is a highly toxic, carcinogenic substance and the strongest oxidant. Spray solutions can destroy the skin, cartilage tissue, and inhalation of vapors - respiratory tract.

At a temperature of about 1300 ° C, as a result of the exchange reaction of sodium dichromate and potassium chloride, potassium dichromate is obtained, the formula of which is K ₂ Cr ₂ O ₇ :

2KCl + Na ₂ Cr ₂ O ₇ → K ₂ Cr ₂ O ₇ + 2NaCl.

This substance is used in industry. Technical potassium dichromate is used for the production of matches, dry batteries, inorganic pigments, paint coatings, as well as in organic synthesis - to produce various kinds of chemical compounds.

A red-yellow solution of potassium dichloride stains the litmus paper in a pale red color. With further boiling, the chemical solution acquires a characteristic dark red color. When the temperature reaches 398 ^° C, potassium dichromate begins to melt and turns into a liquid of a dark brown color, which upon subsequent cooling solidifies and crystallizes. Above 500 ^° C, the substance completely decomposes to form oxygen, chromium oxide and potassium chromate.

Physicochemical properties of potassium dichromate

Rules for storage and transportation of a chemical substance of an increased hazard class

Technical potassium dichromate can be transported by any kinds of covered transport, except air. A chemical substance, packed in special containers intended for one-time use, can be transported by an open rolling train. Technical potassium dichromate must be stored in dry warehouses, while the product in specialized containers of a single use can be stored in open areas equipped with a hard coating for water flow.

Packing of a chemical belonging to the first class of danger

Technical potassium dichromate is packed in specially designed steel drums, as well as polyethylene bags consisting of five layers, weighing up to 50 kg. It is allowed to pack in soft containers of specialized purpose for one-time use.

The established hazard class for a chemical

Technical potassium dichromate is explosive and fire-hazardous. By the degree of impact on the human body, he was given the first class of danger. When working with a chemical, it is necessary to observe safety precautions, to be extremely cautious and attentive, and personal protective equipment for the skin and respiratory organs should be used.