[Boxxxed]

In gold mining , cyanide solutions are often used to dissolve AuBr from ore samples.  In the presence of cyanide ions, CN-, gold forms a soluble complex according to the following reaction:   Au+ + 2CN- ↔ Au(CN)2-.  The formation of this complex causes the AuBr in the ore to dissolve.  The Au(CN)2- complex has a Kform = 2.0x1013 and the Ksp of AuBr is 5.0x10-13.


Would this be the correct net reaction?
AuBr-->Au + Br
Au + 2CN-↔ Au(CN)₂

AuBr+2CN---Au(CN)2+Br

[rabolisk]

That's confusing. Please don't neglect charges on ions.

[Boxxxed]

AuBr ↔ Au ⁺ + Br^-
Au ⁺ + 2CN^- ↔ Au(CN)2

AuBr + 2CN^- ↔ Au(CN)2 + Br^-

Should be good now, this is correct?

[rabolisk]

No. Charge is not balanced.