okay you talked about using a graph and we made one so this is the formula from it.
y = 2.2019x
y = absorbance
x= concentration
so if i have an absorbance of .02, do i do...
.02/2.2019= .0091
.0091 would be x so it would be the concentration
is this right???
Yes, or if you have a graph you should be able to read the concn directly from the graph without any calculation (if the units are such that you can read to that precision). (By the way, the 2.2 number is the a I was talking about. The Beer-Lambert Law is
A = abc
A is the absorbance (you have called it y but that's ok), a is the molar absorbance (a constant for each kind of analytical determination you are doing), b is the path length, and c is concn. I think the way you have done it, then 2.2 number is a*b. Since you use the same cell, however, b never needs to enter into the calculation.