You are Here: Home

# Are my equations for magnesium in copper aqueous solution correct? watch

1. I just want to know if the following makes any sense. If it doesn, what am I doing wrong?

Oxidation: Mg(s) → Mg2+(aq) +*2e

Reduction: Cu2+(aq) + 2e → Cu(s)

Balanced equation: 2 Cu3+(aq) + Mg(s) → 2 Cu(s) + 2 Mg2+(aq)

2. no
3. (Original post by daiigou)
no
And what am I doing wrong?
4. Where did the cu3+ come from and why do you need to put numbers in front when the electrons are already balanced?
5. Cu2+ (aq) + Mg (s) = Cu(s) + Mg 2+(aq)
6. (Original post by C_Yap)
Where did the cu3+ come from and why do you need to put numbers in front when the electrons are already balanced?

Ah, the 3+ was a typo, I meant to say 2+ whether that is correct or not, so:

Cu2+(aq) + Mg(s) → Cu(s) + Mg2+(aq)?

This is literally my first time doing anything like this. I am a MAJOR novice at this.
7. (Original post by daiigou)
Cu2+ (aq) + Mg (s) = Cu(s) + Mg 2+(aq)
Ah, thanks! I am not sure where those numbers came from! I probably forgot to delete them as I copied another balanced equation for a template (so I don't forget where things go). Much appreciated, daiigou and C_Yap!
8. (Original post by Moribundus)
Ah, thanks! I am not sure where those numbers came from! I probably forgot to delete them as I copied another balanced equation for a template (so I don't forget where things go). Much appreciated, daiigou and C_Yap!
It is always a good idea to proof-read your own work, PARTICULARLY in exams.

Nay, more than a good idea, it is essential.
9. (Original post by charco)
It is always a good idea to proof-read your own work, PARTICULARLY in exams.

Nay, more than a good idea, it is essential.
I always proofread my work on assignments and exams but I sometimes fail to do so when I am working on problems like this. I would have noticed my error eventually before I submitted my coursework but I am glad that others noticed it before me and I am chuffed that my equations are right when my typing errors were removed.

The only reason I was asking if my equations were correct is because this is literally the first time I have done something like this, so it is actually hard for me to proofread this especially as I missed out on studying redox reactions due to illness and had to pretty much use an educated guess to formulate the equations.
10. I assume you didn't proof read that response either because there are a few errors. You should really take more care.
11. (Original post by daiigou)
I assume you didn't proof read that response either because there are a few errors. You should really take more care.
No, I do not bother proofreading informal replies. Also you should have proofread your first reply as you forgot to capitalise the n in ''no'' and you missed out a full stop at the end of your exceedingly short sentence.

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 14, 2018
Today on TSR

How do you think you'll do?

### University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University