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Environmental fate & pathways

Hydrolysis

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Description of key information

Ammonia will not hydrolyse.  The substance is highly soluble in water and will be present in an equilibrium as ammonia and the ammonium ion.  The balance of the equilibrium will be influenced by concentration and pH, however the ammonium ion will be predominant at relevant pH and low concentrations. 

Key value for chemical safety assessment

Additional information

In the aqueous environment, ammonia will be present as ammonia (NH3) or ammonium ion (NH4+); the relative proportions of the two chemical species are dependent on pH and (to a lesser extent) temperature. At environmentally relevant pH values of 5- 8, the predominant form will be NH4+. At higher pH values the proportion of ammonia (NH3) increases.