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Dissociation constant

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Description of key information

Dissociation constant: <2, <2, 4.3, 5.46, 6.66, 12.3 

Key value for chemical safety assessment

Additional information

Dissociation constant values of <2, <2, 4.3, 5.46, 6.66, 12.3 are also obtained by valid read across from its parent acid at 25 °C (Martell 1968). The result considered as reliable and has been selected as key study.

Dissocation constant values of 0.5, 1.6, 4.6, 5.9, 7.2, 12.9 were determined in a reliable study conducted according to generally accepted scientific principles and the result is suitable for supporting study. (Lacour 1999).

The speciation of ammonia/ammonium in solution is understood in relation to the pKa of ammonium, which has a value of 9.25 (published in Lide, 1999 and Budavari, 1996 and reported in the Ammonia Category SIAR).