Romix
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Cu(NO3)2 + Sn = ?
CuNO3 + Sn = Stannic acid and no visible displacement, nitrate was lightly acidic.
[Edited on 9-10-2025 by Romix]
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chempyre235
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Did you get any fumes? Any precipitate? Color shift?
"However beautiful the strategy, you should occasionally look at the results." -Winston Churchill
"I weep at the sight of flaming acetic anhydride." -@Madscientist
"...the elements shall melt with fervent heat..." -2 Peter 3:10
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Romix
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No fumes, precipitate white jelly Stannic acid, blue
solution before and after addition of Sn.
[Edited on 9-10-2025 by Romix]
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DraconicAcid
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Odd. Surely you mean Cu(NO3)2, btw.
How long did you leave it?
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Romix
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Yes, sorry, wrong valency, precipitate formed almost immediately.
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bnull
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The nitrate, was it bought or you made it?
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DraconicAcid
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The stannic hydroxide ppt is going to be voluminous. Leaving it sitting for a while, and you'll probably start to see copper metal forming.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Romix
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I made it.
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Romix
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Quote: Originally posted by DraconicAcid  | | The stannic hydroxide ppt is going to be voluminous. Leaving it sitting for a while, and you'll probably start to see copper metal forming.
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Was there for couple of days, with out any visible displacement.
Maybe not enough Sn and solution too acidic, I will try this experiment again.
[Edited on 9-10-2025 by Romix]
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chempyre235
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@Romix: In the picture you posted, it appears that you'd started to dissolve circuit boards in the solution. Was this after the tin, or was it your
source of tin?
"However beautiful the strategy, you should occasionally look at the results." -Winston Churchill
"I weep at the sight of flaming acetic anhydride." -@Madscientist
"...the elements shall melt with fervent heat..." -2 Peter 3:10
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Romix
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| Quote: Originally posted by chempyre235 | | @Romix: In the picture you posted, it appears that you'd started to dissolve circuit boards in the solution. Was this after the tin, or was it your
source of tin? |
Source of tin.
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bnull
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Source of tin and lead, you mean.
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chempyre235
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And probably several other metals.
"However beautiful the strategy, you should occasionally look at the results." -Winston Churchill
"I weep at the sight of flaming acetic anhydride." -@Madscientist
"...the elements shall melt with fervent heat..." -2 Peter 3:10
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Romix
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No, lead free solder used on PCBs.
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bnull
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Source of tin and silver, then. But remember that not every PCB uses lead free solder, what with those damned whiskers and all.
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Romix
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No, only Tin able to displace in these.
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bnull
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How did you make the nitrate? Acid plus copper?
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Romix
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3% nitric + Copper, correct.
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pesco
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Thanks Romix, That is an excellent idea !
I will soon try to "de-tin" pcb's with ZnNO3. Any possible base metals would not displace it like they would with Cu(NO3)2
It should be less work than using HCl and if the ZnNO3 is essentially a catalyst that means no losses.
I remember dealing with stannic acid before ad it was a PITA to filter, but never tried to improve the process as it was just incidental need. Maybe
decantation would work or boiling it would firm up the precipitate to ease filtering.
Anyone here had more experience with stannic acid precipitate?
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Romix
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| Quote: Originally posted by pesco | Thanks Romix, That is an excellent idea !
I will soon try to "de-tin" pcb's with ZnNO3. Any possible base metals would not displace it like they would with Cu(NO3)2
It should be less work than using HCl and if the ZnNO3 is essentially a catalyst that means no losses.
I remember dealing with stannic acid before ad it was a PITA to filter, but never tried to improve the process as it was just incidental need. Maybe
decantation would work or boiling it would firm up the precipitate to ease filtering.
Anyone here had more experience with stannic acid precipitate? |
Please let me know how it goes, if Tin reacts into stannic acid on contact with aqueous ZnNO3.
[Edited on 22-2-2026 by Romix]
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Romix
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Never tried coagulating Stannic acid by boiling it, might work, might not.
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