This is molar absorptivity of FeSCN 2+ ion. To calculate the initial concentration of SCN, use proportion: Initial SCN concentration = (Standard concentration) x (Volume KSCN) / (Total volume) Your standard concentration is 2.0 mM = 2.0x10-3 M Total volume is 10 mL (check it). To calculate the initial concentration of iron, use proportion.
1. The problem statement, all variables and given/known data
I have calculated the molar absorptivity of phenol, I'm pretty sure it's correct but I can't for the life of me figure out what I've done. Any help would be really appreciated.
2. Relevant equations
Beers Law:
A = εbc
Where A is absorbance, ε is the molar absorptivity, b is the path length the radiation traverses (1 cm) and c is the concentration of the compound in solution (mol L-1).
3. The attempt at a solution
I have an absorbance of 0.0745. Then to get the number of moles I have done the following:
0.0283 and 10601 are constants as they appear throughout my calculations, but I have absolutely no idea where they have come from. Kicking myself for not keeping this in my lab book... lesson learned!
I have calculated the molar absorptivity of phenol, I'm pretty sure it's correct but I can't for the life of me figure out what I've done. Any help would be really appreciated.
2. Relevant equations
Beers Law:
A = εbc
Where A is absorbance, ε is the molar absorptivity, b is the path length the radiation traverses (1 cm) and c is the concentration of the compound in solution (mol L-1).
3. The attempt at a solution
I have an absorbance of 0.0745. Then to get the number of moles I have done the following:
0.0283 and 10601 are constants as they appear throughout my calculations, but I have absolutely no idea where they have come from. Kicking myself for not keeping this in my lab book... lesson learned!
ANSWER:'e is a measure of the amount of light absorbedper unit concentration'.
Molar absorbtivity is a constant for a particular substance, soif the concentration of the solution is halved so is theabsorbance, which is exactly what you would expect.The formula forthe molar absorptivity is given as followings:
A=ecl
e=A/cl
e = the molar absorptivity
where A is known as the A is known as the absorbance, l measuresthe length of the solution the light passes through,c istheconcentration of solution in mol /dm^3.
Remember that the absorbance of a solution will vary as theconcentration or the size of the container varies. Molarabsorptivity compensates for this by dividing by both theconcentration and the length of the solution that the light passesthrough. Essentially, it works out a value for what the absorbancewould be under a standard set of conditions - the light travelling1 cm through a solution of 1 mol dm-3. a
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