I tried to remove the stains of ferric chloride of my beaker with chromic acid but it didn't work out. Is there any way to completely clean glasswares stained with ferric chloride?
You may also make use of a 100g/l solution of oxalic acid ; so you can also remove Iron III hydroxyde on glass and even on stainless steel without corrosion ; conditions : room temperature .
Dear Mr Dutta, I usually employ hydrocloric acid 37%. The stains are due the hydrolisis of iron chloride at pH near neutral or alkaline. Iron hydroxide or hydrated complexes of iron chloride are probably these stains. Therefore, in acidic medium at very low pH, the equilibrium is displaced for iron chloride which is soluble in water. Chromic acid removes redox substances and in this case I think that problem is just solubility. I hope that this answer helps you. If hydrocloric acid doesn't work, please, describes that occurred. Good luck.
You can try cleaning with citric acid. Add citric acid to water and then put the mixture on to the glassware stained with ferric chloride. Keep it for 30 min and then clean with a brush. It should work.........
You can try with citric acid solution to remove glass wares stains of Ferric Chloride. Prepare aqueous solution of citric acid and keep it in glassware till stains get removed.
I think you can try HCL and water (1:1 v/v) to remove the ferric chloride stains.
You can also try mild hydrofluoric acid.
I would first try and soak it overnight in the acid bath recommended by APHA (2005) for removing metal traces from glassware: HNO3 (1 part), HCl (2 parts), and H2O (9 parts). Hope this helps!
You can try with citric acid if not works good then try with oxalic acid.
isopropanol : KOH = 1:1 alkaline solution and corrosive keep the stainned glass in it for one day and washed wit plenty of water.
Note: use gloves
You can wash with saturated stannous chloride solution. Fe3+ will convert into Fe2+ and you can observe the change in colour of it. Take proper care while using stannous chloride. It is highly skin corrosive. Don't allow it to spill.
You may also make use of a 100g/l solution of oxalic acid ; so you can also remove Iron III hydroxyde on glass and even on stainless steel without corrosion ; conditions : room temperature .
Stains left by ferric chloride in laboratory glassware may be very difficult to clean, in practice. Nevertheless, both hot anhydrous (i.e. glacial) acetic acid and concentrated sulphuric acid can be seriously considered among the best possible options for cleaning.
A “rust stain removal formula”, which is claimed not to etch glass, was proposed by Robert F. Crist (Iron Out, Inc.; Fort Wayne, IN), Patent US 6,297,208 B1, Oct. 2, 2001. It suggests use of hot aqueous solution of ammonium bifluoride and boric acid (which react to form fluoboric acid) complemented with added oxalic acid. You may check this reference for details.
I have tried some reducing agent, like sodium formaldehyde sulfoxylate, to remove the stains. It works.
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