^^K₂CO₃ potassio carbonato. Potassa. Cenere.

Dal carpino nero della Lunigiana alla potassa caustica.

Esp: Preparazione lisciva: bollire le ceneri di legno.

Per secoli la lisciva è stata il migliore detergente da bucato.

Esp: Preparazione del carbonato di potassio dalla cenere di legno

http://www.itchiavari.org/chimica/lab/k2co3.html

Potash, potassa.

potash =  obtained leaching the ash of burnt wood or tree leaves and evaporating the solution in a pot.

K₂CO₃ Potassium carbonate is the primary component of potash, because plants have little or no sodium content, and the rest of a plants' major mineral content consists of calcium salts of low water solubility.

K₂CO₃ Potassium carbonate

• first identified in 1742 by Antonio Campanella
• is the primary component of potash

Pearl ash or salts of tartar

Historically created by baking potash in a kiln to remove impurities.

Composizione delle ceneri di combustione. Come si forma K₂CO₃  nelle ceneri della combustione?

K₂O ossido di potassio, Potassium_oxide

K₂O A contatto con l'acqua, reagisce violentemente formando KOH idrossido di potassio. Il composto è corrosivo e fortemente irritante.

KOH, idrossido di potassio, Potassium_hydroxide, Calcinated or caustic potash.

Processo di caustificazione del K₂CO₃ con Ca(OH)₂:

KOH historically was made by boiling a solution of potash with slaked lime

a metathesis reaction which caused CaCO₃  to precipitate, leaving  KOH  in solution. Filtering off the precipitated  CaCO₃  and boiling down the solution gives KOH.

Potassium

Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH), by the use of electrolysis of the molten salt with the newly discovered voltaic pile. Potassium was the first metal that was isolated by electrolysis. Later in the same year, Davy reported extraction of the metal sodium from a mineral derivative (caustic soda, NaOH, or lye), not a plant salt, by a similar technique, demonstrating the elements, and thus the salts, to be different.

A reaction of potassium metal with water. >>>

Hydrogen is liberated that burns with a pink/lilac flame, the flame color owing to burning potassium vapour. Strongly alkaline potassium hydroxide is formed in solution.

Ca(OH)₂ idrossido di calcio, Calcium_hydroxide, calce spenta o calce idratata. Slaked lime.

Se riscaldato a 512 °C l'idrossido di calcio si decompone in ossido di calcio e acqua.

CaO ossido di calcio, calce, calce viva

CaCO₃ calcium carbonate

Wikipedia

K₂CO₃ Potassium carbonate, Carbonato di potassio

Carbonate

CO₃²⁻ +2 H₂O ↔ HCO₃⁻ + H₂O + OH⁻ ↔ H₂CO₃ +2 OH⁻

H₂CO₃ +2 H₂O ↔ HCO₃⁻ + H₃O⁺ + H₂O ↔ CO₃²⁻ +2 H₃O⁺