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    
  • E-mail: info@shanghaimetex.com

 

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  • Description
  • Analysis

Description

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 photomechanical process. The best alternative to potassium dichromate is sodium dichromate.

Properties of Potassium dichromate

It is odorless, denser than water, and soluble in water.

Chemical formula K2Cr2O7
Molar mass 294.185 g/mol
Appearance red-orange crystalline solid
Odor odorless
Density 2.676 g/cm3, solid
Melting point 398 °C (748 °F; 671 K)
Boiling point 500 °C (932 °F; 773 K) decomposes
Solubility in water 4.9 g/100 mL (0 °C)
13 g/100 mL (20 °C)
102 g/100 mL (100 °C)
Solubility insoluble in alcohol, acetone
chemicals structure potassium dichromate structure

Productions

Potassium dichromate is naturally present in sand, ash, and clay. In addition, it can be found in chrome-plated steel tools such as silverware, handles, bracelets, and more.

This product is produced in two ways. The most common method of production is by reaction of potassium chloride with sodium dichromate. It can also be obtained from roasting chromite ore with potassium hydroxide from potassium chromate. This substance is soluble in water and dissolves into ions due to dissolution in water.

K2Cr2O7 → 2 K+ + Cr2O72−

Cr2O2−7 + H2O ⇌ 2 CrO2−4 + 2 H+

This substance decomposes by heat with the evolution of oxygen.

4 K2Cr2O7 → 4 K2CrO4 + 2 Cr2O3 + 3 O2

Potassium chromate is produced industrially using potash:

K2Cr2O7 + K2CO3 → 2 K2CrO4 + CO2

Applications

Since sodium dichromate is more industrially produced as an alternative to this substance, K2Cr2O7 is not widely used. The most important use of it as a precursor is chromium-potassium alum. This substance is used in leather tanning.

This material has a variety of uses, which are briefly mentioned:

In tanning leather, dye, pigment and printing, decorating porcelain, photolithography,  staining wood, pyrotechnics, bleaching palm oil, wax and sponges; waterproofing fabrics; safety matches, oxidizer; electric batteries; as depolarizer for dry cells. corrosion inhibitor, Pharmaceutic aid, Redox reagent.

wood treatment

it is used in the painting of certain types of wood. This material creates a dark and deep brown appearance in the wood, which is not achieved with modern colors.

wood treatment

cleaning

Chromium (VI) compounds, such as chromium trioxide, sodium dichromate, and potassium dichromate, are commonly used to make “chromic acid,” which is used to clean glassware and etched materials.

titration

With acidic potassium dichromate, the concentration of ethanol in a sample can be determined by reverse titration. In this reaction ethanol with excess potassium dichromate, all ethanol is oxidized to acetic acid:

CH3CH2OH + 2[O] → CH3COOH + H2O

3 C2H5OH + 2 K2Cr2O7 + 8 H2SO4 → 3 CH3COOH + 2 Cr2(SO4)3 + 2 K2SO4 + 11 H2O

potassium dichromate titration

Side effects

this product primarily affects the respiratory tract. Symptoms of this allergy include ulcers, shortness of breath, bronchitis, pneumonia and asthma. In addition to the lungs and respiratory system, it can also affect the digestive system, liver, kidneys and immune system. It increases the risk of lung cancer and sinus cavity cancer.

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references:

https://pubchem.ncbi.nlm.nih.gov/compound/Potassium-dichromate#section=Uses

https://en.wikipedia.org/wiki/Potassium_dichromate

https://www.contactdermatitisinstitute.com/potassium-dichromate.php

https://www.toppr.com/ask/question/in-acidic-medium-k2cr2o7-exists-as-cr2o72-orange-while-in/

Analysis

potassium dichromate metex COA-page-001