A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%.
A) Calculate the absorbance (A) of each solution.
B) Using the absorbances calculated in 1a, calculate the FeSCN2+ concentration of the unknown solution.
To calculate the absorbance (A) of each solution, we can use the formula:
A = -log10(%T/100)
A) Calculate the absorbance (A) of the first solution:
A1 = -log10(18.8/100)
Next, calculate the absorbance (A) of the second solution:
A2 = -log10(44.8/100)
B) To calculate the FeSCN2+ concentration of the unknown solution, we can use the Beer-Lambert Law, which relates absorbance (A) to concentration and path length:
A = ε * b * C
Where:
A = Absorbance
ε = Molar absorptivity (constant for a given substance at a specific wavelength)
b = Path length (typically in cm)
C = Concentration (in Molarity)
The equation can be rearranged to solve for C:
C = A / (ε * b)
In order to solve for concentration, we need the molar absorptivity (ε) and path length (b) values for FeSCN2+ at the specific wavelength used in the experiment. If these values are provided, we can substitute them into the equation along with the absorbance value (A2) of the unknown solution.
C = A2 / (ε * b)
If specific values for ε and b are not provided, it is not possible to calculate the exact FeSCN2+ concentration of the unknown solution without additional information.