Mixed, very concentrated solutions of zinc chloride and ammonium chloride or from a solution of zinc oxide or zinc hydroxide in ammonia, ammonium zinc chloride (NH4) 2 [ZnCl4] (soldering salt) crystallized. A solution of zinc in concentrated hydrochloric acid, which contains as much ammonium chloride such as zinc (soldering), eliminates the oxide by a piece of metal (copper, iron) before it can be soldered or tinned. [8]
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