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Arsenic Acid

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Identification
Molecular formula
H3AsO4
CAS number
7778-39-4
IUPAC name
arsenic acid
State
State

At room temperature, arsenic acid is typically found as a solid; however, it can also be encountered as an aqueous solution. It is a hygroscopic compound, meaning it can absorb moisture from the air, leading it to transition into the solution state under certain conditions.

Melting point (Celsius)
35.50
Melting point (Kelvin)
308.65
Boiling point (Celsius)
315.00
Boiling point (Kelvin)
588.15
General information
Molecular weight
141.94g/mol
Molar mass
141.9430g/mol
Density
2.5000g/cm3
Appearence

Arsenic acid typically appears as a white, deliquescent solid. It can also be found in solution form as a clear liquid. In its crystalline form, it is highly soluble in water.

Comment on solubility

Solubility of Arsenic Acid

Arsenic acid, with the chemical formula H3AsO4, exhibits notable solubility characteristics in various environments. It is predominantly soluble in water, making it an important compound in both laboratory and industrial applications. Here are some key points regarding its solubility:

  • Solvent Interaction: Arsenic acid readily dissolves in polar solvents, particularly water, due to its ability to form hydrogen bonds.
  • Concentration Influence: The solubility can increase with temperature; thus, higher temperatures may promote greater dissolution rates.
  • PH Impact: Its solubility is affected by the pH of the solution, with more acidic conditions enhancing its dissociation and consequent solubility.
  • Saturation Limits: At elevated concentrations, precipitation may occur, leading to less soluble forms, which emphasizes the importance of monitoring concentration levels.

Overall, arsenic acid is a soluble compound in water, but its behavior in solution can be influenced by various factors, including temperature, pH, and concentration. As such, it's crucial to consider these factors in applications where H3AsO4 is utilized.

Interesting facts

Interesting Facts about Arsenic Acid

Arsenic acid, also known as arsenic(V) acid, is a fascinating compound that has garnered attention for both its chemical properties and its implications in environmental chemistry. Here are a few interesting points:

  • Structural Insights: Arsenic acid is an example of an oxoacid, where the arsenic atom is surrounded by oxygen atoms. It can be thought of as analogous to phosphoric acid, owing to its ability to form similar salts.
  • Toxicity Awareness: Despite its acidic properties, arsenic acid is notably toxic. The health risks associated with arsenic compounds have led to strict regulations in many countries regarding its use and disposal.
  • Industrial Applications: Arsenic acid is used in a variety of industrial processes, including the production of pigments, glass, and in the manufacture of certain semiconductor materials. Its unique properties make it valuable in the chemical industry.
  • Environmental Impact: The persistence of arsenic in the environment can lead to contamination of water sources, thus presenting significant remediation challenges. Scientists are actively researching methods to mitigate its harmful effects.
  • Historical Context: The study of arsenic compounds dates back centuries. Historically, arsenic was used in agriculture as a pesticide, but its health implications have since led to its ban in many areas.

"The study of arsenic acids reflects the broader principles of chemistry, where we unravel the dual nature of compounds that can be both beneficial and harmful," said a renowned chemist. This highlights the importance of careful handling and respect for the intricate balance of chemical substances.

In conclusion, arsenic acid serves as a stark reminder of the complexities and responsibilities of working with chemical compounds. Its unique properties and applications provide endless material for study and discussion among chemists and environmental scientists alike.

Synonyms
Arsenenic acid
10102-53-1
Arsenic acid, (O3-As-H)
DTXSID80883090
DTXCID701022670
Meta-arsenic acid
Metaarsenic acid
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