Nickel(II) sulfate is a chemical compound with the formula NiSO4. It consists of nickel in a +2 oxidation state and a sulfate ion. This compound typically appears as a greenish crystalline solid and is soluble in water. Nickel(II) sulfate is often used in electroplating, as well as in the production of nickel salts and catalysts. In addition to its industrial applications, nickel(II) sulfate is also used in laboratories for various chemical reactions. It can be found in some fertilizers and is important in the study of nickel chemistry. However, it is essential to handle this compound with care, as it can be toxic and harmful to the environment.