a chloride soluble in excess NH4OH

If more ammonia is added, then the precipitated zinc hydroxide redissolves to a colourless solution of a soluble zinc ammine, a complex ion.
Zn(OH)2(s) + 2NH4OH + 2NH4Cl --------> [Zn(NH3)4] Cl2 + 4H2O

 Tetrammine Zinc chloride

If more ammonia is added, then the precipitated zinc hydroxide redissolves to a colourless solution of a soluble zinc ammine, a complex ion.
Zn(OH)2(s) + 2NH4OH + 2NH4Cl --------> [Zn(NH3)4] Cl2 + 4H2O

 Tetrammine Zinc chloride

 

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