Ferric chloride

In order to etch my own printed circuit board, I bought some ferric chloride.

The seller instruction is to dissolve 40g in 110.5ml of water.

To concoct 1 molar solution of FeCl3, according to its molecular weight, one will need 162.2g for every 1L of water.

So with 100ml, 16.22g is needed.

40/110.5*100/16.22 = 2.232mol.

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