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When the Nickel (II) ion reacts with ammonia, most students notice only a color change occurring....

When the Nickel (II) ion reacts with ammonia, most students notice only a color change occurring. Some student also notice a white ppt. Write the net ionic reactions to explain what the color change is and what the ppt could be?

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Answer #1

Nickel(II)-ions are precipitated by ammonia as a green gelatinous precipitate of nickel(II)hydroxide,reaction is given as

Ni2+ (aq) + 2 OH- (aq) 2 Ni(OH)2 (s) [light green]ppt

This Ni(OH)2 which dissolves forming a deep blue hexaaminenickel(II) hydroxide at excess ammonia , reaction is given as-

Ni(OH)2 (s) + 6 NH3 (aq) [Ni(NH3)6]2+ (aq) + 2 OH- (aq) [deep blue]
Ni 2+(aq) +2OH-(aq) + 6NH3(aq)---> [Ni(NH3)6]2+ (aq) + 2 OH- (aq) [deep blue]

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