Project:Deactivating a ferric chloride solution: Difference between revisions
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Project:Deactivating a ferric chloride solution (view source)
Revision as of 11:01, 29 May 2010
, 29 May 2010→Deactivating a Ferric Chloride solution
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Project maintained by Daniel Sikar ~/ dsikaratgmaildotcom. | Project maintained by Daniel Sikar ~/ dsikaratgmaildotcom. | ||
== Deactivating a | == Deactivating a ferric chloride solution == | ||
=== In practice === | === In practice === | ||
* Example | * Example | ||
A solution that was made with a packet of | A solution that was made with a packet of ferric chloride (FeCl<sub>3</sub>) crystals weighing 300 grams requires 222 grams of sodium hydroxide (NaOH) to be deactivated. | ||
After deactivation, the neutralised solution will contain | After deactivation, the neutralised solution will contain iron hydroxide (Fe(OH)<sub>3</sub>) which is rust and sodium chloride (NaCl) which is common table salt. | ||
Both are innocuous and can be poured down the drain. | Both are innocuous and can be poured down the drain. | ||
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* Method | * Method | ||
Pour the spent | Pour the spent ferric chloride solution in a plastic bucket - do not use metal buckets, add about 5 times its volume of water. | ||
Dissolve 222 grams of | Dissolve 222 grams of sodium hydroxide in about 3 litres of water. | ||
In a thin stream, add the | In a thin stream, add the sodium hydroxide solution to the ferric chloride and stir. Once it turns rust coloured it is ready to be | ||
discarded. | discarded. | ||
If not discarded, on standing, the | If not discarded, on standing, the iron hydroxide will separate out at the bottom, while at the top, a crust of copper carbonate (CuCO<sub>3</sub>) will form due to the copper from etched circuits. | ||
The | The iron hydroxide at the bottom is a standard commercial pigment and can be separated off the solution and added to latex paint. | ||
[[File:Deactivated_FeCl3_Solution.jpg|200px]] | [[File:Deactivated_FeCl3_Solution.jpg|200px]] | ||
