Posted by david on Monday, April 14, 2008 at 1:56pm.
The Beer-Lambert Law.
A = abc.
Use A = abc for the standard to calculate the constant, a (the absorptivity). b = cell length (but you don't need to use that IF both standard and unknown were measured using the same cell. Then use A= abc on the unknown to calculate FeSCN^+2 in the final solution. Knowing how much that is will let you determine the amount of KSCN remaining unreacted in the final solution. Notice that you obtain c (the concn of the standard by mols/L = M. Note also that the standard solution is prepared and you must calcualte molarity; i.e., it isn't 0.200 M. Post your work if you get stuck.
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