Caustic soda bụ a siri ike alkali na ike corrosiveness, n'ozuzu n'ụdị flakes ma ọ bụ blocks, mfe soluble na mmiri (exothermic mgbe etisasịwo na mmiri) na-etolite ihe alkaline ngwọta, na deliquescent Mmekọahụ, ọ dị mfe itinye mmiri vepo (deliquescent) na carbon dioxide (mmebi) n'ikuku, a pụkwara itinye ya na hydrochloric acid iji chọpụta ma ọ na-akawanye njọ.