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Make chrome alum; Leather tanning; Handling Safety. Ammonium dichromate is flammable, oxidizer and a known carcinogen Storage. Ammonium dichromate should be kept in plastic containers, with a proper label and a hazard symbol. Keep it away from acids and open flame sources. Disposal. Can be reduced to Cr(III) using aqueous solutions of ascorbic ...
Preparation of Ammonium iron (III) sulphate (ferric alum) Ferric alum (NH4Fe(SO4)2), of similar structure to ordinary alum, (potassium aluminium sulphate, KAl(SO4)2), is of interest because it forms (sometimes?) violet to clear crystals that are supposed to be suitable for crystallisation trials.
Ammonium Alum: simple synthesis from OTC materials Although originally referring to the potassium aluminium double sulphate (KAl(SO4)2.12H2O), once one of the most important sources of water soluble Al salts and precursor to the name ‘alumin(i)um’, alums are now considered a class of chemical compounds of the general structure MM’(SO4)2.12H2O where M is a monovalent cation (e.g. K+, Na+ ...
Manganous-Ammonium alum and derivatives for use of toluene oxidation to benzaldehyde Inspired by Cycloknight's posts in the Toluene--->Benzaldehyde thread, I decided to have a go at making the manganous-ammonium alum descibed in US patent 808095.
ammonium alum and sodium carbonate Hello i recently reacted some (NH4)Al(SO4)2 and sodium carbonate, i want to know what happened. Did the sodium carbonate reacted with the aluminum sulfate making alumimum carbonate and sodium sulfate, or did it react with the ammonia giving some other compouund?
The combined last batches or peroxide and nitric alum have been recrystallised (100 alum + 50 water) at 83.3 % crystallisation yield, this calculates to a solubility of about 30 g alum (dodecahydrate) /100 g of water at fridge temperature (just above 5 C). The crystals are… pale violet.
We know ferric ammonium alum comes in two colour variants but we don't really know why (it's been discussed elsewhere here). The colourless crystals in MrHS sample are FAA too, not ammonium sulphate. [Edited on 20-12-2013 by blogfast25]
Sciencemadness Discussion Board » Fundamentals » Organic Chemistry » Manganous-Ammonium alum and derivatives for use of toluene oxidation to benzaldehyde
The other alum I've grown crystals from is chrome alum, and this can be mixed with aluminium alum in all proportions, just like a dye. Those more exotic alums are very interesting, especially cobalt! I have some cobalt(II)chloride which I'll have to convert to the sulphate first.
Why first use copper? You can dissolve aluminium in dilute sulphuric acid and then add the ammonium sulfate to a solution of aluminium sulfate. In theory this gives ammonium alum. I think that you will meet many practical problems, but such an exercise indeed can be quite rewarding and you can learn a lot of it. [Edited on 26-3-13 by woelen]