Question

Silverware (dining ware actually made of silver) can tarnish by reacting with H2S to form Ag2S, making it look dirty no matter the amount of cleaning. In order to remove this tarnish (Ag2S), the silverware can be added to a solution containing baking soda in an aluminum pan, allowing the aluminum to react with the tarnish, as shown in reaction 1.

Reaction 1: 2 Al(s) + 3 Ag2S(s) + 6H206(l) --> 6Ag(s) + 2 Al(OH)3(aq) + 3 H2S(g)

1. If a tarnished spoon has a mass of 683.90 g before being added to the solution and the cleaned, the untarnished spoon had a mass of 677.29 g. (Note: think about the reaction and the relationship to the mass lost). What was the mass % of tarnish (Ag2S) in the original tarnished spoon?

Answer 1

Mass of Ag2S = 683.90 - 677.29

= 6.61 grams

Mass of total = 683.90

Mass % = (mass of Ag2S / mass of total ) *100

= (6.61/683.90)*100

= 0.9665 %

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