Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hey...just trying to plan an investigation so any help would be fantastic

    Does anybody know if it is possible (or safe!) to heat a potassium manganate solution so that you are left with the crystals?

    If it is not are there any other methods of determining the concentration of manganese in a solution apart from colorimetry, titration or electrochemical cells?

    Thank you!!

    xxx
    Offline

    1
    ReputationRep:
    I have heated potassium permanganate before, I think, but you have to be careful not to let it get too hot, and that was for the purpose of looking at the oxidation states - I don't know what would apply for evaporating. I'm not sure whether it's safe!

    Is it possible to make a precipitate that you could weigh? Apparently potassium salts are usually soluble though... does anything more reactive than potassium precipitate with manganate(VII)?
    • Community Assistant
    • Study Helper
    Offline

    17
    ReputationRep:
    Community Assistant
    Study Helper
    Potassium permanganate decomposes when heated (it releases oxygen) - the solution itself tends to reduce the MnO4(-) ions to MnO2 at elevated temperatures.
    Even if KMnO4 is left on the shelf for some time it 'goes off' unless the acidity is high - it is usually made up in 2M H2SO4.
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thanks, might try an EDTA titration...unless anyone has any clever ideas??
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 7, 2006

University open days

  • Heriot-Watt University
    School of Textiles and Design Undergraduate
    Fri, 16 Nov '18
  • University of Roehampton
    All departments Undergraduate
    Sat, 17 Nov '18
  • Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 17 Nov '18
Poll
Have you ever experienced bullying?

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

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.