Question

What substance is produced at the anode during the electrolysis of molten calcium bromide, cabr2? assume standard conditions?

Answer 1

Answer: Bromine is produced at anode.

Step-by-step explanation:

On electrolysis of molten calcium bromide, the following reaction occurs:

`CaBr_2(l))\rightarrow Ca^(2+)(l)+2Br^-(l)`

In molten
`CaBr_2` there are
`Ca^(2+)` and
`Br^-` ions.

At cathode which is a negative terminal , cations will be reduced.At anode which is a positive terminal , anions will be oxidized.

At cathode:
`Ca^(2+)+2e^- \rightarrow Ca(s)`

So, calcium is deposited at cathode.

At anode:
`2Br^-\rightarrow Br_2+2e^-`

At anode
`Br_2` is produced.

Thus bromine is produced at anode.

Answer 2

Answer is: bromine.

Molten calcium bromide is separeted: :
CaBr₂(l) → Ca(l) + Br₂(l),
but first ionic bonds in this salt are separeted because of the heat:
CaBr₂(l) → Ca²⁺(l) + 2Br⁻(l).

Reaction of reduction at cathode(-): Ca²⁺(l) + 2e⁻ → Ca(l).

Reaction of oxidation at anode(+): 2Br⁻(l) → Br₂(l) + 2e⁻.

The anode is positive and the cathode is negative.