How do you know whether Ag)2O dissolved to give an ammine complex or an argentat

Question

How do you know whether Ag)2O dissolved to give an ammine complex or an argentate(I) ion [a complex anion of silver e. g., Ag (OH)_2^-] (Consider what happened to Ag_2O in excess OH^- when you examined the reactions of Cl^- in Experiment 2.) Write the equations for dissolving Ag_2O and AgCl in the NH_3 solution. Equation for Ag_2O: ______________ Equation for AgCl: ____________ In each pair shown below, which species appears to form stronger bonds to Ag^+? (i) OH^- or NH_3? __________ Why? __________ (ii) Cl^- or NH_3? __________ Why? ___________

Explanation / Answer

4. Ag2O when dissolved in a strongly basic solution it forms Ag(OH)2^-. This reaction is reversible when HCl is added to the system wherein, formation of AgCl precipitate occurs.

5. Balanced equations,

Ag2O + 4NH3 + H2O --> 2[Ag(NH3)2]OH

AgCl + 2NH3 ---> Ag(NH3)2Cl

6. The one which forms stronger bond with Ag+ is,

(i) Ag+ is a soft acid which would form stronger bond with soft base NH3. OH- is a hard base. By rule soft-soft interaction is stronger then soft-hard interaction.

(ii) Ag+ is a soft acid which would form stronger bond with soft base NH3. Cl- is a stronger base.

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