Sodium hydroxide is a white, moisture-attracting substance. NaOH formulation. It is easily soluble in water and forms a soft, slippery and soap-like solution. Sodium hydroxide (called caustic soda or suds caustic) is used to trap acidic gases such as CO2 in the laboratory. The industry is used in the construction of many chemical materials, artificial silk, soap, paper, paint, detergent industry and oil refineries.