What is AsH2? Important knowledge about AsH2.

1. AsH₂, also known as Arsine, is a chemical compound with a molecular weight of 78.924 Da. Each molecule of AsH₂ consists of one Arsenic (As) atom and two Hydrogen (H) atoms. It does not form ions in solution.

2. The properties of AsH₂:
   2.1 Physical properties:

   • AsH₂ is colorless, odorless gas under standard conditions and can cause nausea.
   • The pH of AsH₂ is not determined because it does not form ions in solution.

2.2 Chemical properties:

• AsH₂ is easily volatile and can catch fire in the air, forming As₂O₃ and H₂O.
• It can also react with many other metals and non-metals.

3. Common chemical reactions with AsH₂:

   • AsH₂ + O₂ -> As₂O₃ + H₂O

4. Preparation of AsH₂:
   4.1 Laboratory preparation:

   • As + 3H₂ -> 2AsH₂
     4.2 Industrial preparation:
   • In industry, AsH₂ is commonly prepared by separating As from As-containing ore by heating it with coke or passing H₂ gas over the hot ore.

Note: Due to the high toxicity of AsH₂, its preparation and use should be carried out under careful professional supervision.