How Do Response Factors for Na and K Compare Using Li as an Internal Standard?

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Homework Statement



Determine the response factors for both Na and K with the Li internal standard

Concentration Ratio
Na : K : Li (in ppm)
5.0 : 5.0: 500
-------------------

Signal Ratio
Na : K : Li (relative units)
4.9 : 6.4: 36.2

Homework Equations



Ax/x = F(As/s)
Ax = absorption signal of analyte
x = concentration of analyte
F = response factor
As = absorption signal of standard
s = concentration of standard

The Attempt at a Solution



Calculation for Na

(4.9)/(5.0) = F [(36.2)/(500)]
F = 13.5

Calculation for K

(6.4)/(5.0) = F [(36.2)/(500)]
F = 17.7

Seems simple enough right? So I was hoping that someone would be able to tell me if this is correct or incorrect because I have a funny feeling I did something strange (problem was too easy).
 
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Discussion

It would be helpful to have more information on the equation and the reference, but based on the limited information provided, Ax/x = F(As/s), it would appear that the answers given are correct.

Is the problem/question based on an example of chromatography and spectroscopy?