suppose we are given the following experimentally observed facts regarding the r

Question

suppose we are given the following experimentally observed facts regarding the reactions of silver ion. a) Ag^+ reacts with Cl^- to give white AgCl(s). b) Ag^+ reacts with ammonia to give a quite stable complex ion, Ag(NH3)2^+. c) A black suspension of solid silver oxide, Ag2O(s), shaken with NaCl solution, changes to white AgCl(s). d) AgCl(s) will dissolve when ammonia solution is added, but AgI(s) does not dissolve under these conditions. Write equations for any net reactions in the cases above; then, based on these observations, arrange each of the substances AgCl, AgI, Ag2O, and Ag(NH3)2^+ in such an order that their solutions with water wold give a successively decreasing concentration of Ag^+

Explanation / Answer

a) reactions with AgCl

AgNO3 + HCl -----------> AgCl(s) + HNO3

AgCl(s) + H2O <===> AgCl (aq) <====> Ag+ (aq) + Cl- (aq)

NH3 + H2O --------------> NH4OH (aq) <========> NH4+ (aq) + OH- (aq)

Ag+ (aq) + 2NH4 OH-------> [Ag (NH3)2] OH + H2 O

b) reactions with Ag2 O

2Ag+ (aq) + 2OH- (aq) ------------> Ag2 O (s) + H2 O (l)

Ag2 O (s) + 4 NH3 (aq) + H2 O (l) ---------> 2[ Ag(NH3)2 ] OH (aq) + 3H2 O

2[ Ag (NH3)2] OH (aq) <======> 2[ Ag (NH3)2 ]+ (aq) + 2OH- (aq)

[ Ag (NH3)2 ]+ (aq) + 2 Cl- (aq)----------> 2AgCl (s) + 2NH3 (aq)

_____________________________________________________________

The aqueous solutions of given salts ( ie. AgCl, Ag2 O , Ag I , & the complex [Ag(NH3)2]+ ion would  give,

Ag+ (aq) in their aqueous solutions based on their Ksp values. Thus the successive decreasing order of Ag+ (aq) in their aqueous solutions should be

AgCl(aq) > Ag I (aq) > Ag2 O (aq) > [ Ag (NH3)2 ]+ (aq)

It should be noted that Ag+ ion is complexed with NH3(aq) , hence is not free to exist as Ag+ (aq)

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.