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Ammonium perborate, NH4BO3

Ammonium perborate, NH4BO3.3H2O, is obtained by dissolving boric acid in 2.5 per cent, hydrogen peroxide, adding ammonia, and precipitating with alcohol. When dried for twenty-four hours over sulphuric acid, the salt 2NH4BO3.H2O is obtained, and this may be dehydrated over phosphoric anhydride.

The salt NH4.BO3.NH4.BO4.2H2O has been described by Petrenko.

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