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Hydroxylamine-monosulphonic Acid, NH(OH).SO3H

Hydroxylamine-monosulphonic Acid, NH(OH).SO3H has been very completely studied by Raschig. The sodium salt is formed according to the following reactions:

1) NaNO2 + NaHSO3 + SO2 = HO.N(SO3Na)2,

2) HO.N(SO3Na)2 + H2O = HO.NH.SO3Na + NaHSO4.

The free acid is very stable. Hot alkalis decompose it according to the equations:

1) 3NH(OH)(SO3K) + 3KOH = N2 + NH3 + 3K2SO4 + 8H2O,
or
2) 4NH(OH)(SO3K) + 4KOH = N2O + 2NH3 + 4K2SO4 + 3H2O.

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