Register to reply

Reactions of Halogens with Metals

Share this thread:
tevatron1
#1
Feb23-12, 09:11 PM
P: 11
To test the ability of Br2 and I2 to oxidize copper metal, the reactions take place between Br2water and I2 solution with copper:

Cu (s) + Br2 (aq) -> Cu2+ (aq) + 2Br- (Aq)

Cu(s) + I2 (methanol) -> Cu2+ (methanol) + 2I- (methanol).

Write the net ionic equations describing the results of these two experiments.

I believe that the Cu (s) should oxidize, and thus color change. Particularly with Br2 water (bromide water), so I recorded the net ionic equation as 2Cu (s) + Br2 (aq) -> 2CuBr(s)

However, I'm unsure if this is correct or what to do with the second equation.

Has anyone ever done these reactions or know them off hand? Is it possible that a precipiate could form between Cu2+ and I2?
Phys.Org News Partner Chemistry news on Phys.org
Building the ideal rest stop for protons
Direct reaction heavy atoms to catalyst surface demonstrated
Cagey material acts as alcohol factory
Borek
#2
Feb24-12, 01:52 AM
Admin
Borek's Avatar
P: 23,393
Why not CuI?

Actually I am sure about CuI, but I am not convinced you will get CuBr and not CuBr2.
tevatron1
#3
Feb24-12, 05:50 AM
P: 11
Quote Quote by Borek View Post
Why not CuI?

Actually I am sure about CuI, but I am not convinced you will get CuBr and not CuBr2.
Well, CuI would have to be a solid. And I'm not convinced a solid was formed in this case. I suppose my main question is if the reaction between Cu and I2 results in a color change to Cu, would the product be a solid? CuI would have to be a solid to be written as such in the net ionic equation.

The lab notes predict Br2 reduces to Br2-, hence my writing CuBr


Register to reply

Related Discussions
Electronegativity of halogens Chemistry 8
Chemistry (halogens) Biology, Chemistry & Other Homework 3
Monochloride compounds of the halogens! Biology, Chemistry & Other Homework 1
Test for Halides/Halogens Chemistry 4
Protonation of Halogens in PVC Biology, Chemistry & Other Homework 1