Question

In the presence of hydrogen sulfide, silver oxidizes to form silver sulfide (silver tarnish). It forms a black film on the surface of silver. 4Ag 2H2S O2→2Ag2S 2H2O One way to reverse the chemical reaction and turn silver sulfide back into silver is by immersing the silver in an aluminum container filled with a hot solution of sodium bicarbonate. Metals like aluminum have a greater affinity for sulfur than silver. This tarnish-removal method uses a chemical reaction to convert the silver sulfide back into silver, resulting in no net loss of silver. The reaction between silver sulfide and aluminum takes place in the presence of a sodium bicarbonate (NaHCO3) solution, resulting in the transfer of sulfur atoms from silver to aluminum, freeing the silver metal and forming aluminum sulfide. The reaction can be summarized as follows: when silver sulfide reacts with aluminum, silver sulfide is reduced to form silver and aluminum is oxidized to form aluminum sulfide. Complete the balanced chemical equation for the reaction, showing the formation of silver metal from silver sulfide in the presence of aluminum metal. Express your answer as the products of a chemical equation. View Available Hint(s) 3Ag2S 2Al → 3 A g 2 S 2 A l →

Answer 1

The equation is:

3AgS2 +  4Al  ---> 2Al2S3 + 3Ag

Answer 2

Answer: The balanced chemical equation is written below.

Explanation:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

$A+BC\rightarrow AC+B$

The chemical equation for the reaction of silver sulfide with aluminium follows:

$3Ag_2S+2Al\rightarrow 6Ag+Al_2S_3$

By Stoichiometry of the reaction:

3 moles of silver sulfide reacts with 2 moles of aluminium metal to produce 6 moles of silver metal and 1 mole of aluminium sulfide

Hence, the balanced chemical equation is written above.