chemistry abs spectrum and wavelength analysis
posted by mary .
Hello, can someone please help me? I'm stuck on a question:
I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and KSCN.
Now, the question is: Suppose there are one or more interfering species in the solution, which also absorb more or less strongly at this same wavelength. How could/should you deal with such a situation of overlapping absorbances?
I've scanned all my notes and I'm still stuck. I think it may have something to do with finding the equilibrium concentrations and then converting values using a ratio formula using the absorbance and concentration values...
A/A = C/C? I think i may be wrong, can someone please explain this theory question to me?

One thing you can do is to use a wavelength other than 450 nm and one which the contaminant doesn't absorb. A second thing you can do, if the contaminant an be identified, is to determine how much of the other material is there and subtract the A due to that material. A third thing you can do is to determine, by successive approximations, the amount of FeSCN+2, a procedure which I simply can't explain on this board. If there is more than one contaminant and the interference is bad, I would go with the first suggestion first.

Wow! Thank you, that makes a lot of sense! I know what you mean by successive approximations, I didn't think of it like that before..
Thank you so much again :)
Respond to this Question
Similar Questions

Honors Chemistry
At what wavelengths do Cr(III) ions absorb the maximum amounts of light? 
calc
Find the critical number(s) of f(x)= abs(2x4) What is the derivative of abs(2x4)? 
maths complex numbers
Can abs(287w)=7abs(w) be written as abs(w4)=abs(w) and if so why surely it should be abs(4w)=abs(w) can any one explain why I can just chane the signs Yes, it can be written that way. I don't see that you have changed any signs, … 
math
would this be a correct proof of the cauchyschwartz inequality: abs=absolute value abs(u*v) is less than or equal to abs(u)*abs(v). Then you divide both sides by abs(u)*abs(v) so that you get cos(theta) is less than or equal to 1. 
chemistry abs spectrum and wavelength
Hello, can someone please help me? I'm stuck on a question: I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and 
please help
In cell D21, type the formula to calculate the % change from January to February. That formula is: =(J18E18)/ABS(E18). Format the result in the Percentage style and decrease the decimal places if necessary to round the result to the … 
calculus
Sketch the curve y = x^3  12x^2 + 36x I already did the question properly it is concave down at (0,4) and concave up at (4,infinity) I found the abs max to be (2,32) and abs min to be (6,0) What I wanted to know is when labeling the … 
math
Hi I Have A Question About Rolle's Theorem Why We cant solve [ F(x) = abs(x) ] ? 
Absolute Value and Limits
solve for limits of 1+ and 1 for this function: (x^2 + abs (x1)  1)/ abs (x1) i don't know how to simplify abs. value expression times polynomial. can someone please help. 
Chemistry
The data below has been taken for the reaction of a dye with the hydroxide ion. The reaction was performed at two different hydroxide ion concentrations while the dye concentration was kept constant. What is the rate law?