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ALKALINE definition: 1. having an effect or chemical behaviour opposite to an acid: 2. having an effect or chemical…. Learn more. Something that is alkaline contains an alkali or has a pH value of more than 7. Some soils are actually too alkaline for certain plant life. The word alkaline has an unique etymology, for it is derived from the Arabic word, al qaliy, which refers to the calcined ashes that were combined with animal fat to make soap. Today, alkaline is often defined as being the opposite of acidic, also called basic. However, scientifically speaking, alkaline has a much narrower definition , for it refers to substances derived from two columns or groups on the Periodic Chart and the various salts and compounds that can be formed from these elements ... Alkali is a term for a basic salt of an alkali metal or an alkaline earth metal, or a base that dissolves in water. Learn about the etymology, common properties, alkali salts, alkaline soil and alkali lakes of alkali.
