Calcium hydroxide is an inorganic compound used for many purposes. Calcium hydroxide is relatively soluble in water. It partially dissolves in water to produce a solution called limewater, which is a moderate base. Limewater or aq. Ca(OH)2 reacts with acids to form salts. As the calcium hydroxide is easy accessible, cheap and has the possibility to neutralize inorganic acids can be successfully used in their decontamination. This paper presents analyzes the decontaminating properties of calcium hydroxide.