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ammonia vs. ammonium

[ uh-mohn-yuh, uh-moh-nee-uh ]
  1. a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH3, usually produced by the direct combination of nitrogen and hydrogen gases: used chiefly for refrigeration and in the manufacture of commercial chemicals and laboratory reagents.
  2. this gas dissolved in water; ammonium hydroxide.
[ uh-moh-nee-uhm ]
  1. the univalent ion, NH4+, or group, NH4, which plays the part of a metal in the salt formed when ammonia reacts with an acid.

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