What about the cation for Ni?
The fourth group of cations include Zn2+, Ni2+, Co2+, and Mn2+. This group is determined by the addition of ammonium chloride, ammonium hydroxide, and hydrogen sulfide gas to the solution of the salt. A colored precipitate indicates Mn2+; a white precipitate indicates Zn2+; and a black precipitate indicates either Ni2+.
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