P4 S2 Pre-Lab Worksheet (1)

P4 S2 Pre-Lab Worksheet (1)

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Chemical Thinking P4 S2 Pre-Lab Worksheet v3.1 | Project 4 Session 2 Pre-Lab Worksheet GRADE ____ /10 p All work must be very neat and organized . If your penmanship is poor, you must type all responses. If you need to organize your thoughts, please use a separate sheet of paper. Question 1 Calculations (6 p) A researcher wishes to determine how the nickel ion (Ni 2+ ) binding capacity of sodium polyacrylate varies as a function of nickel ion (Ni 2+ ) concentration. Employing a similar procedure to that presented in the Project 4 Guide , the researcher has recorded the following: Concentration of Ni(NO 3 ) 2 Solution (M) Mass of Sodium Polyacrylate (g) Incubating Volume of Ni(NO 3 ) 2 Solution (mL) Absorbance of Incubating Solution at λ max = 725 nm Volume of Filtrate Collected (Unabsorbed Ni(NO 3 ) 2 Solution) (mL) Absorbance of Collected Filtrate at λ max = 725 nm Mass (g) of Ni 2+ Absorbed per Mass (g) of Sodium Polyacrylate 0.050 0.098 40.0 0.821 37.9 0.801 .00886 0.025 0.108 40.0 0.409 36.8 0.373 .00945 0.010 0.100 40.0 0.163 33.9 0.129 .00773 0.0050 0.105 40.0 0.081 30.1 0.047 .00661 0.0025 0.102 40.0 0.042 25.1 0.011 .00491 0.000 0.099 40.0 0.001 15.5 0.000 0 Notice the use of absorbance spectroscopy, in this case at a wavelength of 725 nm which is the λ
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