How do you know your stannous doesn't work?Assol said:Thank you for your help!!!
If I make the solution of sulfamic and water, how long does the solution keep stable? (Days?)
I can propose the same question making the solution of FeSO4...(in my experience I do it every time)...
I dont understand what is appening whit my chemical store... i bought some pure tin (Sn) to make the stannous chloride for the soution test and doesn't work... Any suggestion?
Grazie!!!!
Warning, if the HCl isn't fully used up it can build up pressure over time when dissolving the tin in a closed bottle... don't ask how I know that. :lol:
Stannous test for gold should be light purple to black for gold. (Dependent on concentration)Assol said:I heat my solution, half liter, first i added some Sulfuric and after some sulfamic solution untill no effervescence.
I made a solution with feSo4 7H2o and water,adding some HCl before mixing with "the new aqua regia" at room temperature.(in the BOOK, they say to add hcl until the solution cames green... my was yellow/ light green).
I would guess that its fine, Ive had a yellowish,
neonish green tint before. I think all the HCl does is make sure the crap that got oxidized is in the proper valence before precipitating. Of course thats just a guess, as I am no chemist
Tomorrow I'll se the result.
probably Was SMB better?
Well, since "good" is a point of view, 'better' must be too. I like to use copperas on my first precipitation, smb on my second, oxalic on my third (if needed). Each has their own limitations and setbacks, so its all a personal flavor type thing.
first of doing all, i tested my aqua regia with the new stannous chloride... it was positive...brown!
do you have any observation about what i have done?
Grazie
alex
Topher_osAUrus said:Just follow proper procedures as best you can, and if something unexpected happens, hopefully you have studied enough to know what is causing the issue.
If not, come back, lay out everything you did step by step, and any observations you had, (pictures help alot), and the good people of the forum here will help you
Assol said:Now, if it is possible for you, I'll write all I did.
Thanks
alex
Assol said:So I heated again the AR, adding some more Chloridric.
The stannous test was positive.
i decided to add 3 littel tabs of urea to see if therewas foam... no foam, i tought to have " neutralized the AR.
i started to Add SMB, I had only 500 grams of it but i tought it could be to much for this operation.. Nooo! 500 grams were not sufficient and the shop was closed. 2 days later I bought Smb and ferrous Sulfate. Heating the AR, i continued to add Smb... untill frizzing.the they after I didn't find a precipitated, just some dirt on the bottom.
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