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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.

____________ M

2.????? Calculate the initial molar concentration of SCN-1?in the unknown solution.

____________ M

3.????? Calculate the initial molar concentration of SCN-1?in the standard solution.

____________ M

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.

____________ M


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.

____________ M

6.????? Calculate the molar concentration of Fe+3?in the unknown equilibrium mixture.

____________ M

7.????? Calculate the molar concentration of SCN-1?in the unknown equilibrium mixture.

____________ M

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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Apr 19, 2020

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