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Strong alkalis are extremely corrosive substances. Solutions ingested can cause tissue destruction of the mouth, oesophagus and stomach. Sodium hydroxide and potassium hydroxide hydrolyse fats in the skin to from fatty-acid anions, which give alkaline solutions a "soapy" feel. The soap is you! Strong alkalis are exceedingly corrosive to human tissues when concentrated or molten. Eye contact can cause blindness, skin contact can result in severe burns. Alkalis are among the most dangerous substances used in the school laboratory. When dissolved in water they generate a great deal of heat, this may cause the solution to splash or boil. Never use hot water to dilute alkalis. Ammonia evolves toxic and corrosive ammonia fumes. Eye and skin protection should always be worn when using strong alkalis. Disposal: Waste solutions of alkalis may be disposed of down the sink with adequate flushing. ALSO SEE SEPARATE LISTING FOR EACH CHEMICAL.
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