I've been given a rpac to set up for senior chem and it requires a solution made up of
200ml distilled water
2g agar powder
1ml 0.1%ohenolphthalein solution
AND
1ml 0.1mol/liter potassium hexacyanoferrate(iii) solution [K3Fe(CN)6]
![Embarassed :oops:](./images/smilies/icon_redface.gif)
I found out via google that the potassium H is also perussian Red. My problem is I don't have any. Has anyone made this solution before, is there an acceptable substitute or can it be left out all together and still get a result?
![Huh ? :?](./images/smilies/huh.gif)
The prac is The effects of mechanical stress and different metals on the corrosion of iron. You wrap Iron nails in either zinc or copper leave one plain and bend the fourth then put them in petri dishes and set them in the above agar.
Any help, ideas or information please
![Pray [-o<](./images/smilies/eusa_pray.gif)
Thanks very muchly in advance
![Very Happy :D](./images/smilies/biggrin.gif)
Kelli