Procedure 3.6.b Jobs Method

Using Stocks 1 and 2, prepare a series of 10 solutions of differing mole ratios as outlined in Table 3.11. 

Obtain a UV-vis spectrum of each solution and record the absorbances at 600 nm. 

For each series of wavelength measurements, plot the mole ratio, x, of pyridine vs Aml- Using either software or a ruler, draw two straight lines following the increasing slopes to an apex. 

Determine where the two lines intersect and record the x coordinate value. From this value of x, and equation (3.15) determine n or the number of equivalents of pyridine ligand bound to [Ni(salpd)]. 

Solution No. Volume [Ni(salpd)] Stock 1 (ml) Volume Pyridine Stock 2 (ml) Mole Fraction of Pyridine, (Xpy) Mole Fraction of [Ni(salpd)], (1 - Xpy) 

---