Are Ammonia (NH3) and Ammonium (NH4+) different substances?

Document ID

Document ID TE1930

Version

Version 4.0

Status

Status Published

Published Date

Published Date 03/05/2019
Question
Are Ammonia (NH3) and Ammonium (NH4+) different substances?
Summary
Amtax sc Measurements
Answer
Ammonia (NH3) and Ammonium (NH4) are in equilibrium when dissolved in water.  The proportion of NH3 and NH4+ in the sample will vary based on pressure, temperature and most importantly pH.  In basic solutions ammonia is the dominant species.  This is important to note when comparing to other instrumentation that may read as NH3 or NH3-N.

 

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