When a minimum amount of aqueous ammonia is added to a test tube containing aque

Question

When a minimum amount of aqueous ammonia is added to a test tube containing aqueous Co3+, a precipitate forms. When an excess of aqueous nitric acid is added to the same test tube , the precipitate dissolves. When a minimum amount of aqueous ammonia is added to a test tube containing aqueous Co3+, a precipitate forms. When an excess of aqueous nitric acid is added to the same test tube , the precipitate dissolves. When a minimum amount of aqueous ammonia is added to a test tube containing aqueous Co",a precipitate forms. When an excess of aqueous nitric acid is added to the same test tube, the precipitate dissolves. 1. (10 pts) In part a, write the balanced net ionic equation that describes the reaction of aqueous Co3 witha minimum amount of aqueous ammonia to form a solid. In part b, write the balanced net ionic equation that explains why the precipitate from part a dissolved in the presence of excess nitric acid. Include the physical state (s), ), (g), or (aq) for all species. a) Net lonic Equation b) Net lonic Equation:

Explanation / Answer

a)

NH3(aq) + H2O <--< NH4OH(aq)

Co3+(aq) + 3NH4OH(aq) --> Co(OH)3(s) + NH3(aq)

b)

when excess NH3

2Co3+ + 12NH3 2[Co(NH3)6]3+

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