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Sodium chromate

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Identification
Molecular formula
Na2CrO4
CAS number
7775-11-3
IUPAC name
disodium;oxido-(oxido(dioxo)chromio)oxy-dioxo-chromium
State
State

At room temperature, sodium chromate is typically in a solid state. It can be found as a crystalline substance that is stable under normal conditions but readily dissolves in water to form a yellow solution.

Melting point (Celsius)
792.00
Melting point (Kelvin)
1 065.15
Boiling point (Celsius)
732.00
Boiling point (Kelvin)
1 005.15
General information
Molecular weight
161.97g/mol
Molar mass
161.9740g/mol
Density
2.7230g/cm3
Appearence

Sodium chromate appears as a yellow crystalline solid. It is deliquescent, meaning it has a tendency to absorb moisture from the air, and can form a solution. Its crystals are typically elongated and have a slight but distinct yellow coloration which makes it easy to identify.

Comment on solubility

Solubility of Disodium Oxido-(oxido(dioxo)chromio)oxy-dioxo-chromium (Na2CrO4)

Disodium oxido-(oxido(dioxo)chromio)oxy-dioxo-chromium, commonly known as sodium chromate, exhibits notable solubility characteristics that are essential to understand in various chemical contexts. Here are some key points regarding its solubility:

  • Solvent Interaction: Na2CrO4 is highly soluble in water, allowing it to readily dissociate into sodium ions (Na+) and chromate ions (CrO42-). This property makes it useful in applications where quick availability of ions is required.
  • Temperature Dependency: The solubility of sodium chromate tends to increase with rising temperature, which can be critical when considering its application in processes involving heat.
  • Effect of pH: In acidic environments, sodium chromate can convert to its less soluble counterpart, chromium trioxide (CrO3), emphasizing the role of pH in controlling its solubility.
  • Environmental Considerations: Due to its solubility, sodium chromate poses potential environmental risks, especially in aquatic habitats, emphasizing the need for careful handling and disposal.

In summary, the solubility of Na2CrO4 in water, its temperature sensitivity, pH interactions, and environmental implications highlight the importance of proper understanding and management of this compound in both industrial and ecological settings.

Interesting facts

Interesting Facts about Disodium Oxido-(Oxido(Dioxo)Chromio)Oxy-Dioxo-Chromium

Disodium oxido-(oxido(dioxo)chromio)oxy-dioxo-chromium, commonly known as sodium chromate, is a fascinating compound with a rich history and significance in various fields. Here are some intriguing aspects of this compound:

  • Historical Significance: Sodium chromate was historically important in the production of pigments, especially in the manufacture of chrome yellow, which was widely used in paints and coatings.
  • Industrial Applications: This compound plays a vital role in the tanning of leather, as well as in the production of dyes and inks. It’s also utilized in the electroplating process to produce a corrosion-resistant layer.
  • Environmental Concerns: While sodium chromate has various industrial uses, it is important to note that chromium compounds, including this one, can pose environmental hazards. The compound is considered a known carcinogen, making proper handling and disposal essential.
  • Color Indicator: Sodium chromate is often recognized by its vibrant yellow color, which can serve as a visual indicator of its presence in various applications and environmental studies.
  • Complex Chemistry: The compound contains chromium in different oxidation states, showcasing its ability to yield dioxo-chromium groups that highlight chromium's versatile chemistry in oxidation and reduction reactions.

In summary, sodium chromate is not only an essential component in various industrial processes but also a reminder of the importance of safety and environmental considerations in chemistry. As we explore this compound further, we can appreciate its dual role as both a useful agent and a substance requiring cautious management.


Synonyms
Sodium dichromate
Sodium bichromate
10588-01-9
Disodium dichromate
Bichromate of soda
Celcure
Natriumdichromat
Sodium dichromate(VI)
Caswell No. 761
Natriumbichromaat
Natriumdichromaat
Celcure Wood Presrvative
Bichromate de sodium
Sodium dichromate (Na2(Cr2O7))
Sodium(dichromate de)
Dichromic acid, disodium salt
Oakite Composition No. 155
Sodio (dicromato di)
Wood Cure A Wood Preservative
HSDB 737
Na2Cr2O7
Chromium sodium oxide (Cr3Na2O7)
UNII-C9G6VY6ZZ4
EINECS 234-190-3
C9G6VY6ZZ4
EPA Pesticide Chemical Code 068304
Natriumdichromat(VI)
CCRIS 8137
Chromic acid (H2Cr2O7), disodium salt
Dichromic acid (H2Cr2O7), disodium salt
sodium dichromate(2-)
SODIUM DICHROMATE (VI)
DTXSID8021274
CHEBI:39483
Na2(Cr2O7)
Na2[Cr2O7]
Sodium dichromate de
Caswell No 761
Disodium dichromate (VI)
Disodium dichromium heptaoxide
DTXCID201274
SODIUM CHROMATE (NA2CR2O7)
SODIUM DICHROMATE (ANHYDROUS)
DISODIUM DICHROMATE (NA2CR2O7)
234-190-3
Dichromate, sodium
Dichromic acid, sodium salt
EINECS 252-062-5
disodium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium
34493-01-1
Chromic acid (H2Cr2O7), sodium salt (1:2)
Natriumbichromaat [Dutch]
Natriumdichromaat [Dutch]
Natriumdichromat [German]
Bichromate de sodium [French]
Sodium(dichromate de) [French]
Sodio (dicromato di) [Italian]
SCHEMBL55553
SODIUM DICHROMATE [HSDB]
DICHROMIC ACID,SODIUM SALT
SODIUM DICHROMATE(VI) [MI]
AKOS015913934
NS00085738
Q407873
10588-01-9(anhydrous); 7789-12-0(dihydrate)