What would be the reaction between Mn2+ and NH3? is it Mn(NH3)? and would this solution react with HNO3, considering it would already have NO3 in it?
The reaction between Mn2+ and NH3 can indeed form a compound called manganese(II) ammine, Mn(NH3)6^2+. To determine whether this solution would react with HNO3, we need to consider the behavior of the species involved.
When Mn2+ reacts with NH3, it coordinates with six NH3 ligands (ammonia molecules) to form the complex ion Mn(NH3)6^2+. This complex ion has a positive charge of +2, balanced by the two negative charges from the nitrate ions, NO3-, if they are present.
Now, when you introduce HNO3 (nitric acid) in the solution containing Mn(NH3)6^2+, the H+ ions from HNO3 can displace the NH3 ligands from the complex. This is due to the greater strength of the coordination bond between the metal ion (Mn2+) and H+ compared to the coordination bond between Mn2+ and NH3.
The result of this reaction would be the formation of new compounds, including manganese nitrate (Mn(NO3)2) and free NH3 molecules. The presence of NO3- in the original complex does not prevent further reactions since the coordination bonds in the complex ion are weaker than the acid-base interaction between H+ and the amine ligands.
To summarize:
1. The reaction between Mn2+ and NH3 forms the complex ion Mn(NH3)6^2+.
2. Introducing HNO3 into the solution would cause the replacement of NH3 ligands with H+, resulting in the formation of manganese nitrate (Mn(NO3)2) and free NH3 molecules.