Homework Help

Balance the equation by writing seperate half reactions for reduction and oxidation...

user profile pic

tikclocktok | eNoter

Posted October 1, 2013 at 2:42 AM via web

dislike 1 like

Balance the equation by writing seperate half reactions for reduction and oxidation processes, balance it, and recombine it back together.

CuSO4 + Ni ---> Cu + NiSO4

1 Answer | Add Yours

user profile pic

jerichorayel | College Teacher | (Level 1) Senior Educator

Posted October 8, 2013 at 11:58 AM (Answer #1)

dislike 1 like

Reduction:

CuSO4             ->        Cu

Oxidation states:

Cu = +2                    Cu -> 0

S = +6

O = -2          

Reduction half reaction

`Cu^(2+) + SO_4 ^(-2) + 2e -> Cu^(0) `

-----------------------------------  

Oxidation:

Ni            ->          NiSO4

Oxidation states

Ni = 0                    Ni = +2

                             S = +6

                             O = -2

Oxidation half reaction

`Ni^(0) -> Ni^(2+) + SO_4 ^(-2) + 2 e `

---------------------------------------

Combine the two reactions:

`Cu^(2+) + SO_4 ^(-2) + 2e -> Cu^(0) `

`Ni^(0) -> Ni^(2+) + SO_4 ^(-2) + 2e` _______________________________________

`Cu^(2+) + Ni^(0) -> Cu^(0) + Ni^(+2)` – final answer

Note:

- The electrons are cancelled since they are present on both sides

- SO4 ^-2 ion is also cancelled since it is a spectator ion

Sources:

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes