Zn2AsO4OH2

Zn2AsO4OH2 is a chemical compound, specifically an arsenate salt, with the chemical formula Zn2AsO4OH2. It is a hydrated double salt of zinc and arsenic, with a molar mass of approximately 299.46 g/mol. The compound is typically found in the form of colorless crystals or white powders.

Zn2AsO4OH2 is formed by the reaction of zinc oxide with arsenic acid, followed by the addition of water. The structure of the compound involves zinc ions (Zn2+) coordinated with arsenate ions (AsO43-) and hydroxide ions (OH-). The arsenate ions are tetrahedral, while the zinc ions are octahedral, leading to a three-dimensional network structure.

The compound is sparingly soluble in water, with a solubility of approximately 0.01 g/100 mL at 25°C. It is stable under normal conditions but can decompose upon heating, releasing arsenic oxides and water.

Zn2AsO4OH2 has limited applications but is significant in the study of arsenate chemistry and in the analysis of arsenic-containing samples. It is used as a standard for the determination of arsenic in water and other samples by various analytical techniques, including atomic absorption spectroscopy and inductively coupled plasma mass spectrometry.

The compound is also of interest in the field of materials science due to its potential use in the development of arsenic-based semiconductors and other advanced materials. However, its use is limited by the toxicity of arsenic and the need for safer alternatives.