can't read?
Nickel nitrate is the inorganic compound Ni(NO3)2 or any hydrate thereof. The anhydrous form is not commonly encountered, thus "nickel nitrate" usually refers to nickel(II) nitrate hexahydrate
N 1504a (OTTO) Nickel(II) nitrate hexahydrate, puriss, ≥98.5% Cas 13478-00-7 - used as a precursor to supported nickel catalysts.