Turn on thread page Beta
 You are Here: Home

# More redox titration questions help needed watch

1. http://imgur.com/a/z8g45
Hi, for this question have I done it correctly for both part a and part b? http://imgur.com/9BUI3cl
My second question is that I am unsure what the information highlighted in orange is for? Is this used to work out the concentration of the Fe2+ ions, although this is not the question.
2. My third question is that I would like to know if I have obtained the right answer for this question. I got 25.5%. Thanks.
3. (Original post by coconut64)
My third question is that I would like to know if I have obtained the right answer for this question. I got 25.5%. Thanks.
It's a stupid question.

You know the relative atomic mass of copper = 63.5
You know the relative mass of hydrated copper(II) sulfate = 249.5
Therfore percentage of copper = 100 * 63.5/249.5 = 25.5

There is absolutely no need for the titration.
4. (Original post by coconut64)
http://imgur.com/a/z8g45
Hi, for this question have I done it correctly for both part a and part b? http://imgur.com/9BUI3cl
My second question is that I am unsure what the information highlighted in orange is for? Is this used to work out the concentration of the Fe2+ ions, although this is not the question.
The oxidation is carried out in acidic conditions (look at the equation for the redox processes) so the salt is dissolved in excess acid to ensure that there are enough hydrogen ions.
5. (Original post by charco)
It's a stupid question.

You know the relative atomic mass of copper = 63.5
You know the relative mass of hydrated copper(II) sulfate = 249.5
Therfore percentage of copper = 100 * 63.5/249.5 = 25.5

There is absolutely no need for the titration.
You've missed the point. That's the theoretical value, in a pure sample.
6. (Original post by an_atheist)
You've missed the point. That's the theoretical value, in a pure sample.
It just turns out to have exactly the same answer ...
7. (Original post by charco)
It just turns out to have exactly the same answer ...
In this situation. Next question like this might not give he sme answer.
8. (Original post by coconut64)
My third question is that I would like to know if I have obtained the right answer for this question. I got 25.5%. Thanks.
I got the same value.

Turn on thread page Beta

### 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 4, 2017
Today on TSR

### Exam Jam 2018

Join thousands of students this half term

### Solo - A Star Wars Story

Poll

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