Chemistry Am I suppose to have a straight line in a standard addition plot? Specifically, I am graphing my data obtained determining Mn in steel using spectrophotometry. I used the Method of Standard Addition to perform the lab. I preform the lab twice and my data goes up and down; however, I was under the impression it was supposed to be a straight line

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter28: Atomic Spectroscopy
Section: Chapter Questions
Problem 28.14QAP
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Chemistry

Am I suppose to have a straight line in a standard addition plot? Specifically, I am graphing my data obtained determining Mn in steel using spectrophotometry. I used the Method of Standard Addition to perform the lab. I preform the lab twice and my data goes up and down; however, I was under the impression it was supposed to be a straight line 

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