Alkalii
Alkalii is a term that appears in some languages and historical contexts to denote substances with alkaline properties, most often the alkalis—soluble bases that form hydroxide ions in water. In contemporary English, the standard term is alkali, and alkalii may be encountered mainly in translations, older scientific writings, or petrochemical and industrial glossaries. The underlying idea traces back to the Arabic al-qaly, meaning ashes used for potash, and it entered European science through medieval and early modern chemical literature.
Classification and properties: The core members of the alkalii concept are the hydroxides of alkali metals,
Uses and applications: Alkali materials are central to many industrial processes, including soap making, paper production,
Safety and handling: Alkalis are caustic and can cause severe chemical burns on skin and eye contact.
Note: The preferred English term for these substances is alkali; alkalii appears mainly in non-English sources