The equation 12HNO3 + 2As2S3 -> 2As2O5 + 12NO + 6H2O

Detailed information about the equation 12HNO₃ + 2As₂S₃ -> 2As₂O₅ + 12NO + 6H₂O:

• The chemical equation above describes the reaction of nitric oxidant (HNO₃) with arsenic sulfide (As₂S₃).
• According to the equation, each mol of As₂S₃ needs 6 mol of HNO₃ to fully react and produce 1 mol of As₂O₅, 6 mol of NO and 3 mol of H₂O.
• This reaction is a redox reaction, in which As₂S₃ is oxidized to As₂O₅ and HNO₃ is reduced to NO.

Reaction conditions:

• The reaction occurs at room temperature.
• The reaction requires the presence of a strong oxidizing agent such as HNO₃.

Reaction process:

• The reaction begins when As₂S₃ comes into contact with HNO₃.
• As₂S₃ is oxidized by HNO₃, generating As₂O₅, NO and H₂O.
• The reaction continues until either As₂S₃ or HNO₃ is exhausted.

Occurring phenomena:

• At the start of the reaction, a color change in the solution can be observed as As₂S₃ is oxidized.
• The reaction produces NO gas, which is brown in color and is a toxic gas.
• The formation of As₂O₅, a white solid, can also be observed.