Inorganic Chemistry Salt Composition
I look for a salt with spesific properties regarding how it dissolves in water, if it is toxic etc. I need an expert in inorganic chemistry that can propose the right salt and composition to my requirements+10 Other Responses
Inorganic Chemicals Production
I have a mysterious white precipitate in my ap chem lab.
In ap chemistry (advanced placement) we do a final lab where we create our own experiment and do it and mine is removing gold from old computers. We did not have access to many so we decided to get as much out as possible. After scraping the board to get them to sizable pieces we put them through a bath of 6m hcl mixed with 30% h202 in a 1;1 ratio to dissolve other metals such as the solder, copper, and tin(which connects the gold foil to the board). During this process a white precipitate formed, i assumed this was a mixture of agcl, al(oh)3, and possibly pbcl2. Today i continued the lab and finally got the precipitate and gold flakes into aqua regia. I used 225ml of 12m hcl and 75ml of 18m hno3 to create the aqua regia. I predicted that most of the white precipitate was agcl and therefore would not react with aqua regia (research said it wouldn t and i don t know what it would make). I came back after 40 minutes of letting it react and everything was dissolved including all of the white precipitate. I m honestly very confused now and don t know what happened and i m scared to attempt to precipitate out the gold encase i accidentally get silver (and leftover copper ions) in the final form. If anyone can help me with figuring out what this white precipitate is i could really use it. Also if you know if there would be a best way to go about precipitating the gold out (sodium metabisulfite, h2o2 reduction, etc) i would love to have some insight on that.+8 Other Responses