Homework Answers
5.a)
The wavelength maximum is 365nm.
The maximum wavelength is chosen, because it has lowest %T and also it has higher sensitivity even at low concentrations.
5.b) Using the interpretation (black line) of the following graph, the concentration of the solution is determined as 0.00046 mol/L at the given absorbance 0.667
2)
| Mass(g) | 52.34 | 67.19 | 39.88 |
| Initial volume mL | 7.56 | 5.34 | 12.44 |
| Final Volume mL | 27.26 | 30.23 | 26.86 |
| Volume of metal mL | 19.7 | 24.89 | 14.42 |
| Density (g/mL) | 2.6569 | 2.6995 | 2.7656 |
a)The average density of the unknown metal is 2.7073 g/mL
b) Identity of the unknown metal is Aluminum (density = 2.70g/mL)
c) % error = (range/correct value)*100
= (0.0073/2.70)*100
= 0.27% error
relative range = (range/average value)*100
= (0.0073/2.7073)*100
= 0.2696
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