Nessler's reagent

[ nes-lerz ]

noun
  1. an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide, used as a test for the presence of ammonia.

Origin of Nessler's reagent

1
First recorded in 1870–75; see origin at nesslerize
  • Also called Nessler's solution.

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