A standard solution of FeSCN2+?was prepared by mixing 18 mL of 0.200 M Fe(NO3)3?with 2 mL of of 0.0020 M KSCN.? An unknown solution was made by mixing 10.0 mL of 0.0020 M Fe(NO3)3?with 6.0 mL of 0.0020 M KSCN and 4.0 mL of deionized water.?
1.????? Calculate the initial molar concentration of Fe+3?in the unknown solution.
2.????? Calculate the initial molar concentration of SCN-1?in the unknown solution.
3.????? Calculate the initial molar concentration of SCN-1?in the standard solution.
4.????? Because the standard solution is prepared with a large excess of Fe3+?the equilibrium concentration of FeSCN2+?is assumed to be equal to the initial concentration of the SCN-.? Determine the equilibrium concentration of FeSCN2+?in the standard solution.
5.????? The value of the ratio Aeq?/ Astd?for the unknown solution at equilibrium was 0.10.? Calculate the molar concentration of FeSCN2+?in the unknown equilibrium mixture.
6.????? Calculate the molar concentration of Fe+3?in the unknown equilibrium mixture.
7.????? Calculate the molar concentration of SCN-1?in the unknown equilibrium mixture.
8.????? Calculate Kc?for the equilibrium at the temperature for this particular solution.? Be sure to show the Kc?expression and the molar equilibrium concentration values substituted into the expression.
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