Attach a plot of absorbance versus [Fe3 l, similar to the sketch in Procedure 1-

Question

Attach a plot of absorbance versus [Fe3 l, similar to the sketch in Procedure 1-6. Connect the points at the two sides of the plot by separate straight lines (use only the values for tubes 1-3 and 7-9 for this purpose). Extend the two lines until they meet somewhere between the two extremes of the IFe"J, at which the two lines Fe"1. What is 02 oresPog the ite"), at which the two lines mecet. 0.0062M Calculate the concentration of (sc From the ratio of the concentrations of ISCN 1, and [Fe"l that yield the maximum concentration of complex and therefore the maximum absorbance, one can determine the ratio of ligand to metal ion.You may have to round up or round down to obtain a ratio that is small whole numbers. Your data indicates that the ratio is (as small whole numbers)

Explanation / Answer

This experiment is mainly done for find the complex formation/formula at which how many ligands binds with metal ion .First find the mole fraction of the metal where two lines are meet i.e.,absorbance is highest and then find the RATIO=[Fe]+3/[SCN]-..Here you actually find the ratio 1:1.You can also find this ratio by using the formula =[Vm/Vm+VL]/[VL/Vm+VL].Here you use total volume of the solution is 6 mL.Therefore VM+VL=6.

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