Question

How should the following reactions depend on ionic strength of the reaction medium : [Pt(NH3)3Br]^+ +...

How should the following reactions depend on ionic strength of the reaction medium :

[Pt(NH3)3Br]^+ + CN^- ---->

Ag^+ + 2NH3 ---->

[PtCl4]^2- + CN^- ---->

[Pt(NH3)2Cl2] + Cl^- ----->

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Answer #1

The most important case in which kinetics of chemical reactions has to be considered involves the reaction between two ions, A and B in aqueous solution in the presence of an electrolyte. If A and B have the same charge, there will be an electrostatic repulsion between them, which will inhibit their approach, and consequently, their reaction rate. The opposite will be true for reactions involving ions with different charges, i.e., reactions between cations and anions. This effect of ionic strength is known as the primary salt effect.

[Pt(NH3)3Br]+ + CN- → [Pt(NH3)3Br]CN

Ag+ + 2NH3 → [Ag(NH3)2]+

[PtCl4]2- + CN- → [PtCl4](CN)2

[Pt(NH3)2Cl2] + Cl- →[Pt(NH3)2Cl3]

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