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Working out whether a redox reaction has happened, if so which elements have been red

Hello,so for homework I have been given these equations to figure out: 1. Whether a redox reaction has occured and if so, which has reduced and which has oxidised.

Here are the following reactions:
1. NaOH + HCl = NaCl + H20
2. Mg + Cu2+= Mg2++ Cu

3. 2Fe + 3Cl2= 2FeCl3
4. 2Na + Cl2= 2NaCl

Am I correct in saying that only number 2 is a redox reaction? I'm doubting myself because i'm baffled as to why they would give me this homework when only 1 is a redox reaction?

Or is number 3 a redox reaction, where Fe has been oxidised (lost electrons) and Cl has been reduced (gained an electron)?
Thank you for any help :smile:
No. Apart from reaction 2, reactions 3 and 4 are also redox reactions.

Your reasoning for 3 is correct. Similar reasoning can be applied to 2 and 4.
(edited 5 years ago)
Reply 2
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Kali5
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Original post by BobbJo
No. Apart from reaction 2, reactions 3 and 4 are redox reactions.

Your reasoning for 3 is correct. Similar reasoning can be applied to 2 and 4.


Ok, after looking at 4 again, Is it that Na has oxidised and Cl has reduced?
Original post by Kali5
Ok, after looking at 4 again, Is it that Na has oxidised and Cl has reduced?


Correct
Reply 4
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Kali5
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Original post by BobbJo
Correct


Ok great thank you so much!

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