Question

Please help...

A student in lab creates a Beer's Law calibration curve with the equation A=7.02M-1c. What is the concentration of the solution if the absorbance is 0.327?

Answer 1

I don't know if I should use this equation which is given: A=7.02M-1c. Since the absorbance is 0.327, I put that in for (A) and we are looking for the concentration (c).

0.327=7.02M-1c

0.327/7.02M-1=7.02M-1c/7.02M-1
0.04658=0.0466

Answer 2

what does M stand for?

Answer 3

Molarity

Answer 4

that is how you would solve it though.

if M is molarity, then what is C?

Answer 5

concentration

Answer 6

but Molarity IS concentration.. why is there 2 units of concentration?

Answer 7

That is what was given to us.

Answer 8

I think my calculation is correct

Answer 9

i mean, the way you're solving it seems right, but i don't think M would stand for molarity, IF, C is concentration.

Answer 10

You are right. I'm guessing my units are in s-1

Answer 11

the answer can't be in units of 1/s, you're finding concentration :S

Answer 12

Could it be in grams?

Answer 13

could be in g/L but not just grams, thats a unit of mass not conc.

Answer 14

Thanks. I need to get it together for real. Thanks for the help and explanation.

Answer 15

no worries! good luck