How do I find absorbance? I have this data
3mL stock 7mL water .350Molarity
The original stock was .500Molarity and 10mL, the 3 and 7 are from a new concentration which is what I have to find the absorbance for
Sorry the 10mL is what you want the new solutions to be
Update again: we found the answer in a lab
hcbiochem
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In order to find the absorbance of this solution, you either have to directly measure it in a spectrophotometer, OR you must have a standard curve that relates absorbance to concentration, OR you you must know the molar extinction coefficient for the compound so that you can calculate the absorbance using Beer's Law
Beers Law: Absorbance = extinction coefficient X path length X concentration
A third possibility is if you knew the absorbance of the original solution, you could use a dilution calculation to determine the absorbance of the new solution.
But, you definitely need more information that you provided here.