The equilibrium constant for the reaction
AuBr4- + 2Au(s) + 2Br- <--> 3AuBr2-
can be determined by preparing a solution of AuBr4- and AuBr2- in contact with a piece of gold metal. The absorbance of the solution due to AuBr4- is measured at 382 nm. In one experiment, a solution containing a total...