Calcium oxide 1,Molecular formula: CaO 2,CAS: 1305-78-8 3, ... a lot of heat, slightly soluble in water, soluble in acid. Corrosive. To eyes, respiratory system and skin irritation.Use:Analytics ... Conform Conform Assay %≥98.0≥97.0Clarity testConform Conform Acetic acid insoluble %≤0.05≤0.1The ignition lose heavy/%25Chloride %≤0 ... .0Ammonia water precipitate%≤0.2≤0.4 AR 99.8% Calcium oxide reagent grade