alkali

/'ælkəlai/
Noun
  1. a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture
  2. any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water
    • bases include oxides and hydroxides of metals and ammonia

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alkali
A scientist adds an alkali to a beaker of red litmus solution, turning it blue.