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How much copper will 1lb of Ferric Chloride dissolve? Answered

How much copper will 1lb of Anhydrous Ferric Chloride dissolve?
How much water does the Ferric Chloride need to be dissolved in?




9 years ago

1 pound of ferric chloride is 454g, 2.78 mol. If we're going on FeIII to FeII and Cu0 to CuII you've got 2.78 mol Cu, 88g. The water requirement is "enough"



Answer 9 years ago

Sorry, I was wrong about the formula for ferric chloride, and lemonie is right.  
Wikipedia gives the reaction (  http://en.wikipedia.org/wiki/Iron(III)_chloride):
 ---------------------Wikipeida quote:
Another important application of iron(III) chloride is etching copper in two-step redox reaction to copper(I) chloride and then to copper(II) chloride in the production of printed circuit boards.[8]
FeCl3 + Cu → FeCl2 + CuCl
FeCl3 + CuCl → FeCl2 + CuCl2

It appears to take 2 moles of ferric chloride to oxidize one mole of copper.  So I come up with one lb FeCl3 (~2.8 moles) will oxidize 1.4 moles Cu, or 177 g (6.3 oz).  

The solubility of FeCl3 is 92g/100 ml, so it takes 492 ml of water to dissolve one pound.

I don't guarantee my calculations.  If this was a homework problem, it was a hard one.  



9 years ago

Woo Hoo! Chem homework!

Where's Kiteman's response when you need it?


9 years ago

 Is this a homework question?  I hope not.  Anyway, I get 0.5 lbs copper dissolved by l lb FeCl2.  The iron chloride takes about 1.5 cups of water to dissolve.