Redox titrations

Watch this thread
S1237
Badges: 14
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 3 months ago
#1
A sample of iron(II) sulfate crystals FeSO47H2O had been left out in the air and some of the Fe2ions had been converted to Fe3. A total of 4.2g of the impure crystals were dissolved in a total of 250cm3 of water and dilute sulfuric acid. Portions of 25cm3of this solution were titrated with a solution of potassium dichromate(VI). The concentration of dichromate(VI) ions in this solution was 0.1moldm3.The average titre was 23.50cm3. Use the following steps to find the percentage purity of the original crystals.
0
reply
TriplexA
Badges: 18
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 3 months ago
#2
(Original post by S1237)
A sample of iron(II) sulfate crystals FeSO47H2O had been left out in the air and some of the Fe2ions had been converted to Fe3. A total of 4.2g of the impure crystals were dissolved in a total of 250cm3 of water and dilute sulfuric acid. Portions of 25cm3of this solution were titrated with a solution of potassium dichromate(VI). The concentration of dichromate(VI) ions in this solution was 0.1moldm3.The average titre was 23.50cm3. Use the following steps to find the percentage purity of the original crystals.
Hi there.

I can't do the Q for you but will give some tips.


First work out any moles from the given data and write a balanced equation and then find the moles of the other substance


Good luck
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

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.

Personalise

Y13's - If you haven't confirmed your firm and insurance choices yet, why is that?

I am waiting until the deadline in case anything in my life changes (25)
18.94%
I am waiting until the deadline in case something else changes (e.g. exams/pandemic related concerns) (15)
11.36%
I am waiting until I can see the unis in person (10)
7.58%
I still have more questions before I make my decision (22)
16.67%
No reason, just haven't entered it yet (34)
25.76%
Something else (let us know in the thread!) (26)
19.7%

Watched Threads

View All