Black powder. Readily soluble in acids. Rapidly
converted to Ni3O2(OH)4 by H2O and bases. Loses water when
heated in vacuum and is converted to Ni3O2(OH)4. Crystal structure: C 6 type.
Preparation
A solution of Ni(NO3)2-6H2O is treated
with sodium acetate and electrolyzed at room temperature.
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