I dissolved some ore in Aqua Regia. My solution is this yellowish orange color. When I test it with stannous chloride I get this dark purplish color. I took half of my solution and and added some Urea (is this supposed to be mixed with water?) until the fizzing stopped. I then added some smb which started turning the solution a darker color. After a few minutes, the solution quickly goes black / dark, and starts fizzing up almost overflowing the beaker and immediately turns into this yellowish solution.
Can anyone explain what might be going on. I thought that once the solution goes black it should start dropping out stuff. Why would my solution turn back to that yellow color. Is it because I don't have all the nitric out?
I went ahead and tried everything again with the remaining Aqua Regia but when I added the urea, I still got some fizzing but it also formed this thick whitish layer at the top of the solution. Don't know what happened there.
Can anyone explain what might be going on. I thought that once the solution goes black it should start dropping out stuff. Why would my solution turn back to that yellow color. Is it because I don't have all the nitric out?
I went ahead and tried everything again with the remaining Aqua Regia but when I added the urea, I still got some fizzing but it also formed this thick whitish layer at the top of the solution. Don't know what happened there.