How do gold smith cleans silver ornaments write the chemical reaction involved
Answers
Answer:
The tarnish-removal method used in this experiment uses a chemical reaction to convert the silver sulfide back into silver. Many metals in addition to silver form compounds with sulfur. Some of them have a greater affinity for sulfur than silver does. Aluminum is such a metal. In this experiment, the silver sulfide reacts with aluminum. In the reaction, sulfur atoms are transferred from silver to aluminum, freeing the silver metal and forming aluminum sulfide.
Since a small electric current is actually running between the silver and the aluminum, you're actually electro-plating the silver back onto the jewelry! The formula looks like this:
3 Ag2S + 2 Al → 6 Ag + Al2S3 silver sulfide + aluminum → silver + aluminum sulfide
I tried it with an all-silver pair of earrings as well as my crystal disco earrings, and it worked great on both. As soon as I placed them in the bowl, the solution started bubbling, showing that the chemical reaction was taking place. After a few minutes, I turned the earrings over, making sure that they were still touching the aluminum foil.
After about five minutes, the bubbles had stopped and the silver looked shiny.
Answer:
Silver sulphide +aluminium - - - silver +aluminium sulphide.
Explanation:
3Ag2S +2 Al - - - 6Ag + Al2S3
Hope this helps you