Etfonedhome
Member
- Joined
- Jul 11, 2017
- Messages
- 12
this was originally a reply to an ongoing thread, but after nearly a week with no replies, I decided to make it a new thread, and delete the previous comment.
Okay..... well, after many hours here, and reading hokes, I decided that I was just foolish enough to try this! I ran into an interesting result, and I'm not sure where to go from here..... ive spent about 5 hours searching here, as far as i can tell, this hasn't been covered before, but common sense tells me I'm probably missing something. Here goes....
The composition of the base material was 33% Ag, 36%Cu, 29%Zn, 2%Sn, and 0.1%Si
In a 1liter open beaker, I added 25g silver solder, cleaned with 70% isopropyl alcohol, well rinsed. (It had some soldering flux plus general grime from sitting around a welding shop).
To this I added 150ml deionized water, and 150ml 70% nitric, in 25-50ml increments. The solution wasn't externally heated. All went as expected.
When the reaction slowed, I added more nitric. The last dose of the first 150ml had no reaction. Heres where it first started to get interesting. There was still around 7 or 8 grams of undigested solder.
I first thought my solution was saturated, so i added 200ml water, and another 150 total nitric in doses, while also pouring boiling water in a Pyrex dish around the beaker. Each add gave a small reaction but nothing dramatic. I could not get that last few grams of solder to digest!
At this point, I realized I had WAY too much nitric, and decided to add more solder. THAT was fun. By far the most violent reaction of the day!
So I added in more solder, ( now at 200g total) when the reaction stopped completely, no fumes, no bubbling on undigested solder, I added deionized water to the 1 liter mark, to cool and dilute.
Gave it a stir, poured off 500 ml to start filtering. This is where it REALLY got interesting.....
I set my pretty bright cloudy BLUE solution aside, while i cleaned my funnel, folded filters, updated my notes etc....
I come back to my beaker to find a bright emerald green solution, with a white precipitate with silvery sparkles. after a few moments of utter confusion, I filtered this, dropped in a clean bar of copper, and nothing happened. The bar turned a bit grey, but nothing formed...
Out of curiosity, I dipped the bar into the original solution that still had undigested solder in it, same result.
Im wondering if the copper in solution is somehow dropping the silver out without the need for the cementing step?
Im on pause here, mostly because I have no clue how to proceed....
Any advice, or reference to information I can read myself would be well appreciated.
Okay..... well, after many hours here, and reading hokes, I decided that I was just foolish enough to try this! I ran into an interesting result, and I'm not sure where to go from here..... ive spent about 5 hours searching here, as far as i can tell, this hasn't been covered before, but common sense tells me I'm probably missing something. Here goes....
The composition of the base material was 33% Ag, 36%Cu, 29%Zn, 2%Sn, and 0.1%Si
In a 1liter open beaker, I added 25g silver solder, cleaned with 70% isopropyl alcohol, well rinsed. (It had some soldering flux plus general grime from sitting around a welding shop).
To this I added 150ml deionized water, and 150ml 70% nitric, in 25-50ml increments. The solution wasn't externally heated. All went as expected.
When the reaction slowed, I added more nitric. The last dose of the first 150ml had no reaction. Heres where it first started to get interesting. There was still around 7 or 8 grams of undigested solder.
I first thought my solution was saturated, so i added 200ml water, and another 150 total nitric in doses, while also pouring boiling water in a Pyrex dish around the beaker. Each add gave a small reaction but nothing dramatic. I could not get that last few grams of solder to digest!
At this point, I realized I had WAY too much nitric, and decided to add more solder. THAT was fun. By far the most violent reaction of the day!
So I added in more solder, ( now at 200g total) when the reaction stopped completely, no fumes, no bubbling on undigested solder, I added deionized water to the 1 liter mark, to cool and dilute.
Gave it a stir, poured off 500 ml to start filtering. This is where it REALLY got interesting.....
I set my pretty bright cloudy BLUE solution aside, while i cleaned my funnel, folded filters, updated my notes etc....
I come back to my beaker to find a bright emerald green solution, with a white precipitate with silvery sparkles. after a few moments of utter confusion, I filtered this, dropped in a clean bar of copper, and nothing happened. The bar turned a bit grey, but nothing formed...
Out of curiosity, I dipped the bar into the original solution that still had undigested solder in it, same result.
Im wondering if the copper in solution is somehow dropping the silver out without the need for the cementing step?
Im on pause here, mostly because I have no clue how to proceed....
Any advice, or reference to information I can read myself would be well appreciated.