for-the-given-cell-notation-write-an-overall-cell-reaction-ni-s-ni2-aq-br2-l-br-

Question

For the given cell notation, write an overall cell reaction:

Ni(s) | Ni²⁺(aq) || Br₂(l) | Br⁻(aq) | Pt(s)

Explain why we need an inert electrode at the cathode.

Accepted Answer

Ni(s) + Br₂(l) → Ni²⁺(aq) + 2 Br⁻(aq)
An inert electrode is needed so that it does not react with bromine.

Answer

Ni(s) + Br₂(l) → Ni²⁺(aq) + Br⁻(aq)
An inert electrode is needed so that it adsorbs the liberated bromine.

Answer

Ni²⁺(aq) + 2 Br⁻(aq) → Ni(s) + Br₂(l)
An inert electrode is needed to adsorb hydrogen gas.

Answer

Ni²⁺(aq) + Br⁻(aq) → Ni(s) + Br₂(l)
There is no need for an inert electrode.