question archive 1) Experiment 1 Calculations (9p)
1) Experiment 1 Calculations (9p)
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1) Experiment 1 Calculations (9p). You wish to determine how the liquid absorption capacity of sodium polyacrylate varies as a function of the nickel ion (Ni2+) concentration. Employing the procedure outlined in the Lab Assignments 7 & 8 Guide for Experiment 1, you obtain the following:
Table LA7-1. Liquid Absorption Capacity of Sodium Polyacrylate as a Function of Nickel Ion (Ni2+) Concentration
Concentration of Ni(NO3)2 Solution (M)
Mass of Sodium Polyacrylate (g)
Incubating Volume of Ni(NO3)2 Solution (mL)
Volume of Filtrate Collected (Unabsorbed Ni(NO3)2 Solution) (mL)
Volume of Ni(NO3)2 Solution Absorbed by Sodium Polyacrylate (mL)
Volume (mL) of Solution Absorbed per Gram of Sodium Polyacrylate
0.050
0.102
40.0
36.1
0.035
0.098
40.0
35.9
0.020
0.101
40.0
34.5
0.010
0.099
40.0
31.9
0.0050
0.094
40.0
29.1
0.0010
0.098
40.0
19.7
0.000
0.103
40.0
12.5
Your task is to the complete the last two columns given the data already present in the table. In the space below, present your calculations; you only have to show one example of each calculation type.
2. Experiment 1 Graphing (7p). Using EXCEL and the above data and results, prepare a volume (mL) of solution absorbed per gram of sodium polyacrylate vs. Ni(NO3)2 concentration plot. Paste-in the plot below.
3. Chemical Explanation of the Trend (4p). For the above Volume of Solution Absorbed per Mass of Sodium Polyacrylate vs. Nickel Nitrate Concentration plot, clearly explain the trend in the data on a molecular level. That is, propose on a chemical level an explanation for the observed relationship between the independent variable (Ni2+ concentration) manipulated and the dependent variable (volume of solution absorbed per mass of sodium polyacrylate) that was measured/determined. Your response must demonstrate a degree of understanding and depth to receive credit.
4. Experiment 1 Prediction (5p). Predict how many grams of sodium polyacrylate would be needed to completely absorb a 0.50 L spill of 0.030 M solution of nickel nitrate. Clearly indicate your reasoning. Show all work - including all calculations.
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