What's the noun for alkaline? Here's the word you're looking for.
alkali
(chemistry) One of a class of causticbases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue.
(Western United States) Soluble mineral matter, other than common salt, contained in soils of natural waters.