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from Latin means "burning"
Calcium oxide (CaO) and Potassium Hydrogen sulphate, (KHS04) in water.
Minerals; Inorganic; Alkalis - Column One
first proved by Hahnemann
Description of the substance
Hahnemann's Causticum is one of the most controversial homeopathic remedies. It is probably a weak solution of Potassium hydrate.
From Hahnemann's Cronic Desease
Take a piece of freshly burn lime of about 1 kg. dip this piece into a vessel of purified water for about one minute; then lay it in a dry dish in which it will soon turn into powder with the development of much heat and its peculiar odour, called lime vapour. Of this fine powder take 60 g and mix with it in a (warmed) porcelain triturating bowl, a solution of 60 ml of bisulphate of potash, which has been heated to red heat and melted, cooled again and then pulverized and dissolved in 60 ml of boiling hot water. This thickish mixture is put into a small glass retort, to which the helm, is attached with wet bladder; into the tube of the helm is inserted the receiver, half submerged in water; the retort is warmed by the gradual approach of a charcoal fire below and all the fluid is then distilled over by applying suitable heat. The distilled fluid will be about 30 ml of watery clearness, containing causticum in concentrated form. It smells like the lye of caustic potash. Taste burning in the throat; it freezes only at a lower temperature than of water. It does not responds to the tests for sulphates and for calcium.
Potassium hydroxide is an inorganic compound with the formula KOH, commonly called caustic potash.
Potassium hydroxide can be found in pure form by reacting sodium hydroxide with impure potassium. Potassium hydroxide is usually sold as translucent pellets, which will become tacky in air because KOH is hygroscopic. Consequently, KOH typically contains varying amounts of water (as well as carbonates, see below). Its dissolution in water is strongly exothermic, meaning the process gives off significant heat. Concentrated aqueous solutions are sometimes called potassium lyes. Even at high temperatures, solid KOH does not dehydrate readily
Approximately 121 g of KOH will dissolve in 100 mL of water at room temperature (compared with 100 g of NaOH in the same volume). Lower alcohols such as methanol, ethanol, and propanols are also excellent solvents. The solubility in ethanol is about 40 g KOH/100 mL.
Because of its high affinity for water, KOH serves as a desiccant in the laboratory. It is often used to dry basic solvents, especially amines and pyridines: distillation of these basic liquids from a slurry of KOH yields the anhydrous reagent.
KOH is highly basic, forming strongly alkaline solutions in water and other polar solvents. These solutions are capable of deprotonating many acids, even weak ones. In analytical chemistry, titrations using solutions of KOH are used to assay acids.