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  1. Ammonium - Wikipedia

    Ammonium is a modified form of ammonia that has an extra hydrogen atom. It is a positively charged (cationic) molecular ion with the chemical formula NH+ 4 or [NH4]+. It is formed by …

  2. Ammonium (NH4+): Definition, Formula, Structure, and Compounds

    What is an ammonium ion. Learn its symbol, charge, preparation, and reactions. Explore a few examples of ammonium compounds along with their uses.

  3. AMMONIUM Definition & Meaning - Merriam-Webster

    The meaning of AMMONIUM is an ion NH4+ derived from ammonia by combination with a hydrogen ion and known in compounds (such as salts) that resemble in properties the …

  4. Ammonium Definition - Intro to Chemistry Key Term | Fiveable

    Ammonium is a positively charged ion with the chemical formula NH4+. It is a key component in various chemical processes, including the formation of buffers, which help maintain a stable …

  5. AMMONIUM | definition in the Cambridge English Dictionary

    AMMONIUM meaning: 1. a type of ion that is derived from ammonia and is contained in chemical compounds of it: 2. a…. Learn more.

  6. ammonium noun - Definition, pictures, pronunciation and usage …

    Definition of ammonium noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  7. Ammonium - wikidoc

    The ammonium cation is a positively charged polyatomic cation of the chemical formula NH 4+. It has a molecular mass of 18.04 and is formed by protonation of ammonia (NH 3). The resulting …

  8. Ammonium ion | chemical ion | Britannica

    The ammonium ions are usually converted to nitrite ions (NO 2−) by Nitrosomonas bacteria, followed by a second conversion to nitrate (NO 3−) by Nitrobacter bacteria.

  9. Ammonium - Simple English Wikipedia, the free encyclopedia

    Ammonium ... Ammonium is an ion. It is an ammonia molecule, NH 3, protonated (with a hydrogen ion added) to make NH 4+. It bonds with negative ions such as chloride to make …

  10. Ammonia or Ammonium? What’s the difference? - USGS.gov

    Mar 7, 2025 · In water, ammonia (NH 3) and ammonium (NH 4+) exist together in an equilibrium that depends on pH and temperature. As the temperature or pH rise, ammonia (NH 3) …