Skip to main content

Chromium(VI)

ADVERTISEMENT
Identification
Molecular formula
Cr
CAS number
18540-29-9
IUPAC name
chromium(6+)
State
State

At room temperature, chromium(VI) compounds are typically found in the solid state, though they can exist in different forms such as salts or oxides, depending on the specific compound involved.

Melting point (Celsius)
1 907.00
Melting point (Kelvin)
2 180.00
Boiling point (Celsius)
4 200.00
Boiling point (Kelvin)
4 473.00
General information
Molecular weight
52.00g/mol
Molar mass
51.9960g/mol
Density
2.3400g/cm3
Appearence

Chromium(VI) compounds can appear in various forms but as solids, they are often bright yellow to orange due to their oxidative state. Some hydrated forms can appear as orange or red crystals or powders. They are noted for their colorful appearance, which is indicative of their strong oxidizing properties.

Comment on solubility

Solubility of Chromium(6+)

Chromium in its hexavalent state, known as chromium(6+) or chromate (CrO42-), exhibits unique solubility characteristics that are noteworthy:

  • Water Solubility: Compounds containing chromium(6+) such as sodium chromate (Na2CrO4) and potassium chromate (K2CrO4) are readily soluble in water, producing yellow solutions that are characteristic of chromate ions.
  • Environmental Impact: Due to its high solubility, chromium(6+) can contaminate water sources, making it a concern for environmental and public health.
  • pH Dependence: The solubility of chromium(6+) species is significantly influenced by the pH of the solution; in alkaline conditions, chromate is more stable and soluble, while in acidic environments, it may convert to less soluble forms.

In addition, some salts of chromium(6+) can form precipitates with divalent metals, which can reduce their solubility in certain conditions. However, when discussing chromium(6+), it is essential to note that its high solubility is coupled with its toxicological effects, making understanding its solubility not only a matter of chemistry but also of health and safety.

Interesting facts

Interesting Facts about Chromium(6+)

Chromium(6+) refers to a +6 oxidation state of the element chromium, which is a transition metal found in the periodic table. This particular oxidation state is significant for several reasons:

  • Toxicity: Chromium(6+) is well-known for its toxic properties and is classified as a carcinogen. Exposure to this compound can occur through air, water, and soil contamination, making it a serious environmental concern.
  • Industrial Uses: Despite its toxicity, chromium(6+) is used in numerous industrial applications, such as:
    • Creating corrosion-resistant surfaces through the process of electroplating.
    • Manufacturing pigments for paints and coatings, providing vibrant colors.
    • Acting as a wood preservative in some formulations.
  • Environmental Impact: The presence of chromium(6+) in water sources is closely monitored due to its detrimental effects on aquatic life. Certain species display acute toxicity when exposed to high concentrations, leading to ecological imbalance.
  • Reduction and Remediation: Scientists are investigating various methods to remediate and reduce chromium(6+) to its less toxic form, chromium(3+), through chemical reduction techniques involving various reducing agents.

As environmental regulations tighten, the push for safer alternatives and remediation technologies continues to grow. The challenge lies in balancing industrial utility with health and environmental safety, making chromium(6+) a fascinating topic of study in both chemistry and environmental science.


Conclusion

In conclusion, while chromium(6+) plays a crucial role in various industries, its potential hazards cannot be overlooked. Continued research and awareness in its usage and disposal are essential for protecting both people and the environment.

Synonyms
Chromium(6+)
18540-29-9
Chromium hexavalent ion
Chromium(6+) ion
Cr(VI)
CHROMIUM (VI)
chromium(VI) cation
Chromium ion (6+)
CHEBI:33007
606-053-1
Chromium(VI)
Hexavalent chromium
Chromium, ion (Cr6+)
Chromium (VI) ion
MFCD00717544
Cr6+
Chromium(6+)ion
Chromium(6+)ions
Chromium(VI) ions
Chromium, hexavalent
Chromium(6+) ions
Hexavalent Chromium - Cr+6 @ 1000 microg/mL in H2O
Chromium (cr(sup 6+))
Chromium, ion(Cr6+)
NCI-C04273
Chromium (VI) Standard: Cr+6 @ 100 microg/mL in H2O
Chromium, ion (Cr 6+)
Chromium (VI) Standard: Cr+6 @ 1000 microg/mL in H2O
Chromium, hexavalent (Cr(VI))
Chromium(VI); Chromium(6+); Chromium hexavalent ion; Chromium, ion (Cr6+); Chromium(6+) ion
chromium(+6) cation
CR+6
DTXSID7023982
SCHEMBL29402449
Cr(6+)
NS00113151
Q26840903
Water Pollution QC Check Sample: Hexavalent Chromium