Question

Ag2S + HNO3 = AgNO3 + H2S
AgNO3 + NaCl = AgCl + NaNO3

Consider the unbalanced equations above. Silver is often mined as the impure silver sulfide. A 6.10g sample of impure Ag2S is heated with excess HNO3 and the H2S is completely removed from the solution during the heating. The solution is filtered to remove any unreacted solids. The filtrate is reacted with excess NaCl. The sample produces 0.290g of AgCl.

A. What is the mass percent of Ag2S in the sample?

B. What is the mass percent of Ag in the sample?

Answer 1

Ag2S + 2HNO3 = 2AgNO3 + H2S

AgNO3 + NaCl = AgCl + NaNO3 

a) 4.11%

b) 3.73%