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Nickel sulfate or Nickel (II) sulfate is an inorganic compound. It is highly soluble in aqueous solutions. This sulfate compound is a green coloured salt or ester of sulphuric acid. It is formed by replacing one or both hydrogen atoms with Nickel (metal) atoms. Nickel sulfate and nickel chloride are highly soluble in water, while nickel oxide is insoluble. Nickel subsulfide is poorly soluble, but is more soluble in biological fluids, presumably due to the effects of local pH, enzymes, and other nickel-binding agents. Nickel Sulfate is an inorganic compound widely used in different industrial processes. It is a highly soluble salt and depending on its state, it can be either blue, green, or yellow colored. It is commonly used in the production of various nickel-based compounds and also acts as a common source for Ni2+ ions used in electroplating.
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