Question

A reaction mixture contains an initial concentration of 0.00647 M SCN- (after mixing, before reacting). At...

A reaction mixture contains an initial concentration of 0.00647 M SCN- (after mixing, before reacting). At equilibrium, the concentration of FeSCN2+ is 0.00381 M. What is the equilibrium concentration of SCN-? Please include units in your answer. Please put your answer in decimal form.

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Answer #1

Fe3+ + SCN-        < -----> FeSCN2+
              0.00647                    0                (initial)
              0.00647-x                x                 (at equilibrium)

given, equilibrium concentration of FeSCN2+ = 0.00381 M
x = 0.00381

so,
equilibrium concentration of SCN- = 0.00647 - x
= 0.00647 - 0.00381
= 0.00266 M

Answer: 0.00266 M

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