Arsenazo I [66019-20-3] is a chemically defined substance with a molecular formula of C16H13AsN2O11S2 and a molecular weight of 548.3. It belongs to the class of complex organic compounds containing arsenic, nitrogen, oxygen, sulfur, and carbon. This compound is classified as danger due to its acute toxicity when ingested. Arsenazo I is commonly used as a dye or indicator in various chemical reactions, particularly in the detection of metal ions such as copper and iron. Its exact mass has been determined to be 547.917671.

• CAS Number: 66019-20-3
• GHS Signal Word: Danger
• Molecular Weight: 548.3
• Molecular Formula: C16H13AsN2O11S2
• Exact Mass: 547.917671
• Hazard Statements:
• H301: Toxic if swallowed [Danger Acute toxicity, oral]