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A solution is 2.5×105 M in Fe+2 and 0.10 M in H2S. At what pH will...

A solution is 2.5×105 M in Fe+2 and 0.10 M in H2S. At what pH will FeS just begin to precipitate 
from the solution? The equilibrium is:

FeS(s) + 2 H3O+(aq)<--> Fe+2(aq) + 2 H2O(l) + H2S(aq). KSPA = 6×102

a. pH= -0.46

b. pH= 2.19

c. pH=1.12

d. pH=4.19

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Homework Answers

Answer #1

1) understanding the solution and solubility product expression.

2) solving for [H+] followed by pH.

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