A chloride of a metal which is soluble in excess of ammonium hydroxide. What is the compound?

The compound you are referring to is likely zinc chloride (ZnCl2). This metal chloride is known for its solubility in water and its ability to dissolve in excess ammonium hydroxide.

Properties of Zinc Chloride

Zinc chloride has several notable characteristics:

• Solubility: It dissolves well in water and ammonium hydroxide.
• Uses: Commonly used in various applications, including as a flux in metalworking and in the production of textiles.
• Reactivity: It can react with bases and acids, forming different compounds.

Why It Dissolves in Ammonium Hydroxide

The solubility of zinc chloride in ammonium hydroxide is due to the formation of complex ions, which enhances its solubility in the solution.