In a typical intro Gen Chem class this might be represented thus:.Continued addition of ammonia results the formation of a soluble deep blue complex copper ammonia ion:.In the typical intro Gen Chem class it is probably sufficient to represent the system thus:.The hydroxide ion reacts with the hexaaquacopper(II) ion to form the insoluble compound, copper(II) hydroxide dihydrate:.Since ammonia is a weak base, when it is added, hydroxide ion forms: This complex ion imparts a characteristic pale blue color to the solution. The copper ion in the aqueous solution of exists predominantly as 2+.
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