Ferroxyl Indicator

kimmy · Post by **kimmy** » 01 Sep 2006, 14:57

Can anyone please help me and tell me how to make up Ferroxyl Indicator 'normal' and Ferroxyl indicator 'deoxygentaed'.

Thanks Heaps
KIM

veram · Post by **veram** » 01 Sep 2006, 15:12

Hi Kim,
Here is my recipe for ferroxyl indicator: Add 3ml of freshly prepared 1% potassium ferricyanide and 0.5ml phenolphthalein indicator to 100ml of 0.1M NaCl. The deoxygenated version is prepared using well boiled , then cooled water.

from Vera

kimmy · Post by **kimmy** » 04 Sep 2006, 12:19

Thanks - tried this and yep it worked.

KIM

rae · Post by **rae** » 04 Sep 2006, 14:10

What is it used for???

Didee · Post by **Didee** » 04 Sep 2006, 15:43

Glad someone else asked this question. I have never heard of this and was feeling like I really should.

Diana

Post by **Robb** » 04 Sep 2006, 20:41

Hi All,

Simply the Ferroxyl Indicator is used primarily to determine the Corrosion characteristics in materials.

The Anodic area will turn blue indicating the ferrous (Fe[sup]2+[/sup])ion (i.e. corrosion) and the first step in the oxidation of iron that eventually leads to the formation of rust:
Fe ---> Fe[sup]2+[/sup] + 2e[sup]-[/sup]

Hope this has helped,

Robb....

Ocean Breeze · Post by **Ocean Breeze** » 05 Sep 2006, 11:45

Is there a 'salt free' version of this recipe? ... for the expt where the nails are in 3 tubes to observe rusting (boiled water, freash water, and salty water). Or doesnt it make a difference? R-S

Post by **Ocker** » 05 Sep 2006, 13:56

G'Day Barb Rainbow
Just use 0.1M solutionof potassium hexacyano iron lll
also calledpotassium ferricyanide lll

Post by **Robb** » 05 Sep 2006, 21:02

Hi All,

Another alternative to Ocker's recipe is to prepare the Ferroxyl Indicator and exclude the salt.

I hope this has added to your repetiore

Robb.....

Ocean Breeze · Post by **Ocean Breeze** » 06 Sep 2006, 10:21

Thanks Ocker and Robb

Australia's Science Forum