Suppose a solution of Co(NO3)2 has an extinction coefficient of 5.1 L/mol-cm at 505nm. On the graph provided, plot a graph of A versus C (mol/L) for solutions of 0.020, 0.040, 0.060, 0.080, and 0.100 M Co(NO3)2 in a 1.00 cm cell. On the same graph, plot the percent transmittance, %T, of each solution versus concentration.
Absorbance = molar absortivity x path length x concentration
with,
molar absorptivity =5.1 L/mol-cm
path length = 1 cm
we get,
absorbance = 5.1 x conc.
Also,
log(%T) = 2 - Absorbance
Calculate all the values and plot the graphs,
Abs | Conc | %T |
0.102 | 0.02 | 79.068 |
0.204 | 0.04 | 62.517 |
0.306 | 0.06 | 49.431 |
0.408 | 0.08 | 39.084 |
0.51 | 0.1 | 30.903 |
Suppose a solution of Co(NO3)2 has an extinction coefficient of 5.1 L/mol-cm at 505nm. On the graph provided, plot a gr...
Suppose a solution of Co(NO3)2 has an extinction coefficient of 5.1L/mol-cm at 505 nm. On graph paper, plot a graph of A versus C (mol/L) for solutions of 0.020, 0.040, 0.060, 0.080, and 0.100 M Co(NO3)2 in a 1-cm cell. On the same graph plot, the percent transmittance, or %T, of each solution versus concentration
The above graph gives the absorbance of vitamin B, solution in water, in a 1.00 cm cell, at 362 nm. Given the information on this graph, answer the following question. What is the molar extinction coefficient of B,, (aq) at 362 nm? 0.180 0.160 y = 0.0217x R2 = 0.8092 Ø 0.140 $0.120 Absorbance (no units) 0.060 0.040 0.020 0.000 0.000 8.000 2.000 4.000 6.000 Concentration (um)
Experiment #9 Post-Lab Problems (continue): 4. If a 0.060 M sample of Co(NO3)2 gave an absorbance of 0.29 at 500 nm in a 1 cm cell. What is the cobalt concentration of a solution giving and absorbance of 0.14 in the same cell at the same wavelength? 5. How are percent transmittance and absorbance related mathematically? What would be the absorbance of a sample with 13% transmittance?
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