You are Here: Home

# OXIDATION NUMBERS urgent Watch

1. Hey guys,

I'm currently doing oxidation numbers, and I find it difficult finding the oxidation number of a less familiar element (Basically an element tha's not oxygen or hydrogen or fluorine as I know they're oxidation numbers).

For example:

Deduce the oxidation state of each bold element:

NaClO3 - Each of oxygen is -2, so in total oxygen is -6. But how am I am able to work out Na and Cl???

KMnO4 - Likewise with this question also.

Thank you!
2. (Original post by rm_27)
Hey guys,

I'm currently doing oxidation numbers, and I find it difficult finding the oxidation number of a less familiar element (Basically an element tha's not oxygen or hydrogen or fluorine as I know they're oxidation numbers).

For example:

Deduce the oxidation state of each bold element:

NaClO3 - Each of oxygen is -2, so in total oxygen is -6. But how am I am able to work out Na and Cl???

KMnO4 - Likewise with this question also.

Thank you!
Have you ever seen a group one metal in a state other than +1? If so, I take my hat off to you. But I haven't...

So 1+Cl+(-6)=0
Cl=+5
and
1+Mn+(-8)=0
Mn=+7
3. Just follow the rules, as explained here:

http://www.chembuddy.com/?left=balan...numbers-method

One of the rules is "alkali metals are always +1". After that both your examples become trivial, as shown by langlitz.
4. (Original post by rm_27)
Hey guys,

I'm currently doing oxidation numbers, and I find it difficult finding the oxidation number of a less familiar element (Basically an element tha's not oxygen or hydrogen or fluorine as I know they're oxidation numbers).

For example:

Deduce the oxidation state of each bold element:

NaClO3 - Each of oxygen is -2, so in total oxygen is -6. But how am I am able to work out Na and Cl???

KMnO4 - Likewise with this question also.

Thank you!
Here's an interactive self test on oxidation numbers ... enjoy
5. This is really useful thanks. Do you know if there are any on shapes of molecules and ions?
6. (Original post by rm_27)
This is really useful thanks. Do you know if there are any on shapes of molecules and ions?
Check this out on shapes of molecules ..

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: January 10, 2015
Today on TSR

### Should I ask for his number?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE