This section is from the book "Materia Medica And Therapeutics: An Introduction to the National Treatment of Disease", by John Mitchell Bruce. Also available from Amazon: The pharmacology and therapeutics of the materia medica.
The salts and preparations of potassium are most conveniently discussed in the following order:
Source. - Obtained from wood ashes by lixiviation, evaporation, and crystallisation.
Characters. - A white crystalline, very deliquescent powder, of caustic alkaline taste. 20 gr. neutralise 17 gr. of citric acid, or 18 gr. of tartaric acid.
Impurities. - Sulphates and chlorides.
Dose. - 10 to 30 gr.
From Potassae Carbonas are made: a. Potassae Bicarbonas. - Bicarbonate of Potash.