Nickel(II) acetate tetrahydrate, 98.0+%

Nickel(II) acetate is the name for chemical compound with the formula Ni(CH3CO2)2·2 H2O or Ni(CH3COO)2·2 H2O also abbreviated Ni(OAc)2·2 H2O. The green tetrahydrate Ni(CH3COO)2·4 H2O is more common. It is used for electroplating.

The compound can be prepared by treating nickel or nickel(II) carbonate with acetic acid. The green tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central nickel centre being coordinated by four water molecules and two acetate ligands. It may be dehydrated in vacuo, by reaction with acetic anhydride or by heat.