Oxidizing Agents

  • Common used oxidizing agents include;
  • KMnO4
  • K2CrO7
  • H2O2
  • *usually requires acidic conditions eg adding sulphuric acid before carrying out the test except MnO4 requires alkaline conditions.

 

i)Potassium Permanganate

  • KMnO4(aq)- purple
  • used to detect Fe2+(aq) in acidic medium.
Test Observation Notes
add dil H2SO4 followed by KMnO4(aq) KMnO4 is decolourised Fe2+ is oxidised to Fe3+ and MnO4(aq) is reduced to Mn2+(aq)
ii)Oxidation of iodide ions
  • I ions are oxidised to yellowish brown iodine(aq)
  • MnO4(aq) are reduced to faint pink Mn2+(aq)

 

iii)Oxidation of hydrogen peroxide
  • MnO4(aq) oxidize H2O2 to water and oxygen
  • MnO4(aq) are reduced to faint pink/colourless Mn2+(aq)

 

iv)Oxidation of Ethanol
  • it is oxidized in alkaline medium to ethanoic acid
  • MnO4(aq) are decolourised

 

K2Cr2O7(aq)-orange

  • stabilized by an acidic environment.
  • acts as an oxidizing agent, while it is reduced to green Cr3+
  • like MnO4 ions, dichromate ions oxidize;
  • Fe(ii) to Fe(iii)- dirty green observed due to mixture of green & yellowish brown;
  • I ions to I2;
  • H2O2 to H2O & O2
  • Dichromate ions oxidize sulphite ions to sulphate and nitrate ions to nitrate.
  • Ethanol can be used to test for dichromate(vi) ions- the sln turns to green

 

Hydrogen peroxide (H2O2)

  • colourless
  • can work in both acidified and alkaline medium.
  • it is reduced to water and there is no O2(g) that is liberated
  • oxygen is liberated only when it is acting as a reducing agent
The table below shows the observations and deductions made when H2O2(aq) is added to a test substance containing some cations and anions;
Observations Deductions Notes
Solutions turns red-brown from pale green Fe(ii)(aq) present Fe(ii)(aq) is oxidized to Fe(iii)(aq)
Solutions turns dark brown & black-brown ppt from pale pink Mn2+(aq) prsent Oxidation of Mn2+ to MnO2(s)
Solution changes from colourless to orange-brown;
a black ppt settles at the bottom after a few minutes
I(aq) present I is oxidized to I2(s).
black ppt are crystals of iodine(s).
orange-brown sln consists of I3-(aq)

Reducing Agents

4 Comments

author

solupred zonder recept in Leuven, België solupred zonder ongewenste bijwerkingen
prednisolone zonder voorschrift in Antwerpen Veilige en legale
solupred zonder recept online verkrijgbaar
prednisolone verkrijgbaar in Leeuwarden – bestel
vandaag nog!
Waar solupred zonder voorschrift te krijgen Koop prednisolone zonder gedoe online
kopen solupred in Zwitserland
Koop solupred online voor snelle verlichting
solupred kopen voor een effectieve behandeling
prednisolone te bestellen zonder voorschrift
Bestel solupred online en bespaar tijd en moeite.

verkoop van prednisolone online
solupred online kopen Hoe prednisolone online te kopen zonder voorschrift
Bestel solupred online in Amersfoort – geen recept nodig!
solupred zonder recept bestellen in Nederland prednisolone
te koop in Breda – bestel vandaag nog!
betaalbare prijs voor prednisolone
solupred zonder recept: Eenvoudig en snel te
bestellen Koop solupred in Nederland
solupred online kopen: Voordelig en discreet
aankoop van solupred in Frankrijk Kan ik prednisolone zonder voorschrift krijgen in Colombia?

solupred te koop in Europa
koop prednisolone in Italië zonder medisch voorschrift in België
Bestel solupred online en ontvang het thuis
solupred prijs per fles in Nederland solupred kopen in Utrecht zonder recept
solupred met of zonder voorschrift in Frankrijk
aankoop van prednisolone van het merk Mylan
prednisolone kopen in Wallonië
prednisolone online kopen: snel en eenvoudig proces in Nederland.
prednisolone online bestellen met snelle levering
solupred met of zonder medisch voorschrift prednisolone
zonder voorschrift online te koop
Informeer naar de prijs van solupred slaappillen
solupred te koop in België zonder voorschrift

Reply
author

Great blog! Is your theme custom made or did you download
it from somewhere? A design like yours with a few simple adjustements would
really make my blog jump out. Please let me know where you got your theme.

Kudos

Reply
author

Awesome things here. I’m very satisfied to look your article.
Thanks a lot and I’m looking ahead to contact you.

Will you kindly drop me a e-mail?

Reply
author

Outstanding post however , I was wanting to know if you could write a litte more on this subject?
I’d be very grateful if you could elaborate
a little bit more. Kudos!

Reply

Leave a Reply

Your email address will not be published. Required fields are marked *