A 0.1500 m sample of CO(NO3)2 gave an absorbance of 0.76 at 505 nm in a 1 cm cell. What is the cobalt concentration of a solution giving an absorbance of 0.52 in the same cell at the same wavelength?
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Based on Lambert Beer's Law, the absorbance A depend linearly on concentration:
A = e•b•c
Where:
A = absorbance,
e = molar absorption coefficient,
b = path length,
c = concentration
As e and b are constant:
c1/c2 = A1/A2
c2 = 0.1500 x 0.52/0.76 = 0.103 M
The concentration of the solution with A = 0.52 is 0.103 M
A = e•b•c
Where:
A = absorbance,
e = molar absorption coefficient,
b = path length,
c = concentration
As e and b are constant:
c1/c2 = A1/A2
c2 = 0.1500 x 0.52/0.76 = 0.103 M
The concentration of the solution with A = 0.52 is 0.103 M
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no clue