Phosphorous Acid [13598-36-2] is applied in various analytical and synthetic procedures as a phosphonic acid. Its molecular formula is H3O3P, with a molecular weight of 81.996. This compound belongs to the groups of acids, inorganic, and phosphorus compounds, inorganic. It carries the danger signal word due to its potential harmfulness if swallowed and corrosiveness to metals.

• CAS Number: 13598-36-2
• Molecular Formula: H3O3P
• Molecular Weight: 81.996
• Exact Mass: 81.98198095
• GHS Signal Word: Danger
• Hazard Statements:
• H302: Harmful if swallowed [Warning Acute toxicity, oral]
• H290: May be corrosive to metals [Warning Corrosive to Metals]