The organic formula for Chromated Copper Arsenate (CCA) is not a simple molecular formula like organic compounds typically have. CCA is actually a mixture of inorganic compounds used as a wood preservative. It consists of copper, chromium, and arsenic compounds.
The exact composition of CCA can vary, but it generally contains copper chromate (CuCrO4) and arsenic pentoxide (As2O5) along with other additives to improve its efficacy as a wood preservative. CCA is typically formulated as a water-based solution or as a powder that is mixed with water or oil before application.
It's important to note that the use of CCA as a wood preservative has been phased out or restricted in many countries due to concerns about the environmental and health impacts of the arsenic component. Alternative wood preservatives with less environmental and health risks are now commonly used.