Consider the following separation scheme:
(picture below)

a.What is present in the precipitate at (X)?

b. Which cation will precipitate next if you continue adding H2S to the above solution?

c. Assuming Z has been removed, what is the identity of Q after the solution has been boiled?

d. How do you confirm the identity of the cation in the above solution.

e. What is the minimum concentration of sulfide ion required for 0.15M Ag+ solution to form a precipitate? (Ksp Ag2S= 6x10-51)