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Caustic Potash
Potassium hydroxide is usually sold as translucent pellets. Samples of KOH become tacky in air because KOH is hygroscopic. Consequently, KOH characteristically contains varying amounts of water (as well as carbonates, see below). Its dissolution in water is strongly exothermic, leading to a temperature rise, sometimes up to boiling point. Concentrated aqueous solutions are called potassium lyes.
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