Does the following reaction occur?

Question

Explain, and show balanced equation.

Ni + AuBr3---->NiBr2 + Au (original)
3Ni + 2AuBr3 ---> 3NiBr(subscript2)2Au (balanced)

Thanks!!! ^.^

Answer 1

Br- is a spectator ion so we practically have to see if the following reaction occurs:

3Ni + 2Au(+3) -> 3Ni(+2) + 2Au

This reaction will occur spontaneously when the E>0
For the oxidation of Ni E01=+0.257 V
For the reduction of Au E02=+1.498 V

For the overall reaction
E0= E01+E02= 0.257+1.498= +1.755>0 so it will occur.

standard reduction potentials are from
http://www.northland.cc.mn.us/Chemistry/standard_reduction_potentials.htm
Note that I used the standard oxidation potential of Ni/Ni+2, that's why I used the opposite (+0.257 V) value than that in the table (-0.257 V) which is a reduction potential.

Answer 2

Ni + AuBr3 -----> NiBr2 + Au (Original)
Ni + 2AuBr3 -----> 3NiBr2 + Au
3Ni + 2AuBr3 -----> 3NiBr2 + 2Au

Looks to be the same as what you got. I think you forgot the plus sign before the Au on the right hand side though. I should be right with mine, too.