A student adds aqueous NH3 to a solution of Ni2+ ions and a precipitate forms. When the student adds excess NH3, the precipitate dissolves and produces a deep blue solution. Which of the following best explains why the precipitate dissolved in excess NH3?

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A student adds aqueous NH3 to a solution of Ni2+ ions and a precipitate forms. When the student adds excess NH3, the precipitate dissolves and produces a deep blue solution. Which of the following best explains why the precipitate dissolved in excess NH3?