Question

Question 1 Calculations (6 p)   A researcher wishes to determine how the nickel ion (Ni²⁺) binding capacity of sodium polyacrylate varies as a function of nickel ion (Ni²⁺) concentration. Employing a similar procedure to that presented in the Project 4 Guide, the researcher has recorded the following:

Concentration of Ni(NO3)2 Solution (M)	Mass of Sodium Polyacrylate (g)	Incubating Volume of Ni(NO3)2 Solution (mL)	Absorbance of Incubating Solution at λmax = 725 nm	Volume of Filtrate Collected (Unabsorbed Ni(NO3)2 Solution) (mL)	Absorbance of Collected Filtrate at λmax = 725 nm	Mass (g) of Ni2+ Absorbed per Mass (g) of Sodium Polyacrylate
0.050	0.098	40.0	0.821	37.9	0.801
0.025	0.108	40.0	0.409	36.8	0.373
0.010	0.100	40.0	0.163	33.9	0.129
0.0050	0.105	40.0	0.081	30.1	0.047
0.0025	0.102	40.0	0.042	25.1	0.011
0.000	0.099	40.0	0.001	15.5	0.000

Notice the use of absorbance spectroscopy, in this case at a wavelength of 725 nm which is the λ_max for the nickel ion (Ni²⁺). Your task is to complete the last column given the data already present in the table. In the space below, present the calculations; you only have to show one example of each calculation type.

Answer 1