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Arsenous acid

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Identification
Molecular formula
H3AsO3
CAS number
13464-58-9
IUPAC name
arsenous acid
State
State

At room temperature, arsenous acid typically exists in a partially hydrated form, displaying characteristics of both solid and liquid states. The compound itself is hygroscopic and often exists in solution or as a paste-like solid depending on the environmental moisture levels.

Melting point (Celsius)
35.00
Melting point (Kelvin)
308.15
Boiling point (Celsius)
315.00
Boiling point (Kelvin)
588.15
General information
Molecular weight
125.94g/mol
Molar mass
125.9440g/mol
Density
2.6800g/cm3
Appearence

Arsenous acid appears as a white or light gray amorphous substance. It can form glassy or crystalline structures under certain conditions. However, it is essential to note that it is typically not encountered in an anhydrous form, as it tends to exist in equilibrium with its anhydride, arsenic trioxide. The substance is also known for forming hydrated complexes, making its appearance variable depending on the environment.

Comment on solubility

Solubility of Arsenous Acid

Arsenous acid, with the chemical formula H3AsO3, exhibits distinct solubility characteristics that merit attention. This inorganic compound is soluble in water, which facilitates its interaction with other substances in aqueous environments. Key points about its solubility include:

  • Moderate solubility: Arsenous acid dissolves reasonably well in water, helping form a solution that can readily participate in chemical reactions.
  • pH dependence: Its solubility can vary with pH changes, reflecting the influence of acid-base equilibria.
  • Complex formation: In solution, arsenous acid can form complexes with various metal ions, potentially affecting both solubility and bioavailability.

It is noteworthy that, while its solubility enables various applications, the presence of arsenic can pose environmental and health risks. Therefore, handling and disposing of arsenous acid must be approached with caution.

Interesting facts

Interesting Facts About Arsenous Acid

Arsenous acid, also known as arsenic trioxide, is a fascinating compound that has garnered significant attention in both scientific research and practical applications. Here are some intriguing aspects of this chemical:

  • Historical Significance: Arsenous acid has been known since ancient times. It was used by various cultures for medicinal purposes and even as a poison. The infamous "inheritance powder" was made from it, showcasing its dual role in history.
  • Industrial Applications: Today, it plays a key role in the production of certain pesticides and herbicides, as well as in the manufacturing of glass and ceramics. Its properties help enhance the durability and performance of these materials.
  • Cancer Research: Researchers have explored its potential therapeutic effects in treating certain types of cancer, especially acute promyelocytic leukemia (APL). As such, arsenic trioxide has been integrated into modern cancer therapies, demonstrating the compound's evolution from a toxic to a potentially life-saving agent.
  • Toxic Nature: Despite its medicinal applications, arsenous acid is highly toxic. Exposure can lead to serious health problems, which necessitates strict regulations and safety measures when handling this compound in laboratories and industry.
  • Environmental Concerns: Arsenous acid can impact water sources, making its management critical. Contamination of soil and water supplies is a significant concern, prompting ongoing research into remediation techniques.

As you study arsenic trioxide, it is vital to consider both its rich historical background and its modern medicinal uses. As the saying goes, "The same substance can be a poison or a remedy," which perfectly encapsulates the complex nature of this compound.

Synonyms
Arsenenous acid
13768-07-5
Arsenite (ion)
Arsenious acid (HAsO2)
DW7NR9H8C4
CHEMBL1909222
DTXSID30160267
NS00076245
Q2823285
Q4796460