The cation M²⁺ reacts with NH₃ to form a series of complex ions as follows: A 1.0 × 10^-3 mol sample of M(NO₃)₂ is added to 1.0 L of 15.0 M NH₃ (K_b = 1.8 × 10^-5). Which of the following would be a dominant species in this solution? A) M(NH₃)²⁺ B) M(NH₃)₃²⁺ C) M²⁺ D) M(NH₃)₂²⁺

Question

Quizplus · Accepted Answer

Since the concentration of the NH₃ is much higher than the concentration of the M(NO₃)₂ (10^3 times), the reaction will favor the formation of the product, which has a higher concentration of NH₃. Therefore, the dominant species in this solution would be the product with maximum concentration of NH₃, which is M(NH₃)₃²⁺.

The Cation M2+ Reacts with NH3 to Form a Series

The Cation M²⁺ Reacts with NH₃ to Form a Series