Dictionary  Ness'ler's rea'gentPronunciation: (nes'lurz), [key] an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide, used as a test for the presence of ammonia. Also called Ness'ler's solu'tion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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