Originally posted by Tholidor
There does seem to be a post missing between neutralizing the nitric and scorching the potato.
S & F while waiting for the "fill"...
edit on 24-2-2012 by Tholidor because: (no reason given)
Darn ... you're absolutely correct that there IS a missing section ... sorry folks
I'll try and get a mod to insert it back into the correct post location.
In the meantime, this is the missing part that describes precipitating or "dropping" the gold.
It fits in between the existing 3rd and 4th post.
Continued from previous post ...
Now that the remaining nitric acid has been neutralized, we can now go ahead and successfully convert the dissolved gold back into a solid form ... in
this case, as a brown precipitate that will settle on the bottom of the glass jar.
To create this precipitate, we now sprinkle approximately half a spoonful of Sodium Meta Bisulphite (MSB) into the yellow liquid.
After a few seconds, a brown cloudiness begins to form and spread throughout the yellow liquid. After a few minutes, the brown precipitate begins to
fall and settle on the bottom of the glass jar and what was once yellow liquid, starts to turn clear. This colour change from yellow to clear is a
sure sign that the dissolved gold is being removed out of solution and precipitated or "dropped" out.
Let the process continue for a couple of hours to ensure all the gold is precipitated.
At this point, looking into the glass jar, we should hopefully see 2 things:
1. What looks like brown "mud" or sediment covering the bottom of the glass jar, and
2. A completely clear liquid where it used to be yellow.
Now, trying very hard to not disturb the brown sediment, pour off as much of the clear liquid as possible into a bucket or other suitable container.
Later, the discarded liquid in the bucket will be considerably diluted with plain water and then disposed of.
The sediment and what little liquid is left will be transferred to the empty and clean shallow glass bowl that we've been using earlier for a boiling
water bath. Once transferred, add sufficient water to just cover the brown sediment, let the sediment settle again, then carefully pour off as much of
the water as possible. We want to give the sediment a really good "wash" so repeat this a couple more times. On the last "wash" try to pour off the
maximum amount of water (but not the sediment !) then let the glass bowl stand somewhere long enough until all the remaining liquid has naturally
evaporated and the sediment is completely dry.
Continued next post ...
edit on 24/2/12 by tauristercus because: (no reason given)