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Tin (II) Sulfide Precipitate

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The best way to ensure complete precipitation of tin(II) sulfide from a saturated solution of hydrogen sulfide is to...
the answer is add a strong base. but I'm not clear on why this the right answer, can anyone explain?

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Solution Summary

This solution explains why adding a strong base to a solution of hydrogen sulfide will help form tin (II) sulfide precipitate.

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Hydrogen sulfide dissociates in water according to the following reactions:

H2S --> H+ + HS-
HS- --> H+ + S-2

In order to form tin (II) ...

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