Question

A reaction mixture of 4.0 mL of 0.002 M SCN- and 5.0 mL of 0.002 M Fe3+ is diluted to 10.0 mL with 0.1 M HNO3 to form the blood-red FeNCS2+ complex. The equilibrium molar concentration of the FeNCS2+ determined from a standardization curve is 1.5x10^-4 mol/L. Calculate, in sequence, each of the following quantities in the aqueous solution to determine the equilibrium constant for the reaction:
Fe3+(aq) + SCN-(aq) <--> FeNCS2+(aq)

A) moles of FeNCS2+ that form in reaching equilibrium

B) moles of Fe3+ that react to form the FeNCS2+ at equilibrium

C) moles of SCN- that react to form the FeNCS2+ at equilibrium

D) moles of Fe3+ initially placed in the reaction system

e) moles of SCN- initially placed un the reaction system

f) moles of FE3+ (unreacted) at equilibrium

G) moles of SCN- (unreacted) at equilibrium

h) molar concentration of Fe3+ (unreacted) at equilibrium

i) molar concentration of SCN- (unreacted) at equilibrium

j) molar concentration of FeNCS2+ at equilibrium

k) Kc = [FeNCS2+]/([Fe3+][SCN-])

Answer 1

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