Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: how to remove a silver oxide stain
John paul III
Hazard to Others
***




Posts: 101
Registered: 28-4-2018
Member Is Offline

Mood: No Mood

[*] posted on 3-8-2020 at 11:38
how to remove a silver oxide stain


I have a silver oxide stain on my plastic window sill. How could i remove it? Would KNO3+H2SO4 work or will it make it worse by forming silver sulfate?
View user's profile View All Posts By User
AJKOER
International Hazard
*****




Posts: 2927
Registered: 7-5-2011
Member Is Offline

Mood: No Mood

[*] posted on 3-8-2020 at 13:40


Per Wikipedia (https://en.wikipedia.org/wiki/Silver_oxide):

"It is soluble in ammonia solution, producing active compound of Tollens' reagent. A slurry of Ag2O is readily attacked by acids"

View user's profile View All Posts By User
Bedlasky
International Hazard
*****




Posts: 868
Registered: 15-4-2019
Location: Beleriand
Member Is Offline


[*] posted on 4-8-2020 at 06:22


Sodium thiosulfate is also good option.



If you are interested in aqueous inorganic chemistry look at https://colourchem.wordpress.com/main-page/

I can offer GC analysis of samples. Just U2U to me for more info.

"An old friend once told me something that gave me great comfort. Something he had read. He said that Mozart, Beethoven and Chopin never died. They simply became music." Dr. Robert Ford, Westworld
View user's profile Visit user's homepage View All Posts By User
woelen
Super Administrator
*********




Posts: 7560
Registered: 20-8-2005
Location: Netherlands
Member Is Offline

Mood: interested

[*] posted on 4-8-2020 at 10:07


The mildest way to get rid of the oxide layer is dissolving some NaHCO3 or Na2CO3 in water. Put a piece of aluminium foil in the solution and put the silver object on the aluminium foil. After a few tens of minutes the silver will look much lighter and cleaner.



The art of wondering makes life worth living...
Want to wonder? Look at https://woelen.homescience.net
View user's profile Visit user's homepage View All Posts By User
Maurice VD 37
Hazard to Self
**




Posts: 55
Registered: 31-12-2018
Member Is Offline


[*] posted on 8-8-2020 at 11:12


The best method for removing silver oxide stain is using ammonia solution or sodium thiosulfate. The use of aluminum foil will just transform the oxide into silver metal. And the stain has changed composition, but it is still there.
View user's profile View All Posts By User

  Go To Top