Chromic acid (CrO₃), also known as chromium trioxide or chromic anhydride, is a reddish-brown flake-like crystal with a melting point of 197°C. It is highly deliquescent and possesses strong oxidizing properties, making it extremely corrosive and highly toxic. Direct contact can cause severe skin damage. Upon dissolution in water, chromic anhydride forms chromic acid (H₂CrO₄) or dichromic acid (H₂Cr₂O₇).
Key properties and safety notes:
Strong oxidizing agent; reacts violently with reducible substances.
Severe corrosion risk to metals, tissues, and mucous membranes.
Emits toxic chromium fumes when heated or exposed to organic materials.
Strict handling precautions required due to carcinogenic and environmental hazards.
(Note: The chemical formula "CrO₈" in the original Chinese text appears to be a typographical error, as the correct formula for chromic anhydride/chromium trioxide is CrO₃.)
