Caustic Soda bụ alkali siri ike nke nwere mmebi siri ike, n'ozuzu n'ụdị flakes ma ọ bụ ihe mgbochi, na-adị mfe soluble na mmiri (exothermic mgbe agbazere n'ime mmiri) wee mepụta ngwọta alkaline, yana deliquescent.
N'ihe gbasara mmekọahụ, ọ dị mfe ịmịnye vapor mmiri (deliquescent) na carbon dioxide (na-emebi emebi) n'ikuku, a pụkwara itinye ya na hydrochloric acid iji chọpụta ma ọ emebiwo.