Why use ammonia to wash basic nickel carbonate?

Neutralization. According to China Chemical Network, basic nickel carbonate is an inorganic compound, which is light green powder, slightly soluble in water, soluble in ammonia water and dilute acid. It is mainly used for special nickel plating, and can also be used for producing nickel salts. Because nickel carbonate is alkaline and ammonia is acidic, they are neutral, so used dishes can be washed.