Iron III solubility

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10 hours ago, uncle duke said:

What can be sugar solution?

any solution "in chemical terms" , means dissolving particles into other , the result status = (solution of ... )

for example :
1. solution of salt ,means mix a particular weight of salt into the water
2. solution of sugar ,means mix a particular weight of suger into the water
btw , the water is also solution of H2O  

the measurements (Molar concentration) "mol/cm3" or "mol/L"

i rember from my study in high school that was in (1992) , 
the mole = 40 litters of water , you can use full , half , or quarter amount of water etc. ... , and desolve on that amount your sugar or any thing else .
not nessesary a water , you can use any other liqued or oil ....

now : 

just mix 2 or 3 tablespoon of sugar in a cup of water , that's it :) 



for --> highly concentration of sugar
dissolve more sugar as much as you can in a glass of water and stir until the rest of sugar dissolve , if there is a remaining sugar cannot dissolve ,so in that point they call it "Saturated solution" , then you can heat your solution to dissolve the rest of that sugar .


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Well. Except that 1 mol of water is about 18 liter (not 40, you may be thinking of gasses which are indeed bout 43 liter per mol under STP), a sugar solution can indeed be a few spoons of sugar in some water. Accurate measurements are not needed.

I do however doubt that FeIII is more soluble in a sugar solution than in plain water, unless the FeIII gets reduced by the sugar to FeII. Salt solution seems more likely to work, as it might form an iron chloride complex ion under some circumstances. I know oxalic acid works, that is the «standard chemical rust dissolver» which is exactly what you need. Add some chloride to speed up the process - essentially rhubarb juice and salt if you want to go «organic»!

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I did some searching, and what I found is that rust, Fe 2 O 3, is sometimes referred to as Iron(III) oxide, and it is apparently insoluble in plain water, but will dissolve in a sugar solution. Since it takes strong acid rather than a weak solution to dissolve it, I'm not sure how much solubility is achieved this way. So that may be what got garbled into a claim that a sugar solution can dissolve Iron III itself.

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