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Physical & Chemical properties

Dissociation constant

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Description of key information

In water, ammonium perchlorate immediately dissociates into perchlorate ion ClO4- and ammonium NH4+ (ATSDR).
The dissociation constants for perchloric acid HClO4, which is not the subject of the present dossier (on ammonium perchlorate), are -7 (pKa) and 21 (pKb) at 25°C in water, confirming that perchlorate ion is the stable form in water (SK Lower).

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Additional information

In water, ammonium perchlorate immediately dissociates into perchlorate ion ClO4- and ammonium NH4+ (ATSDR). The dissociation constants for perchloric acid HClO4, which is not the subject of the present dossier (on ammonium perchlorate), are -7 (pKa) and 21 (pKb) at 25°C in water, confirming that perchlorate ion is the stable form in water (SK Lower). Considering both perchloric acid and ammonium perchlorate, it is concluded that perchlorate ion (ClO4-) and ammonium (NH4+) are the only stable forms in water.