Absorbance = εcl

• ε = molar extinction coefficient (molar absorptivity) Note: Things that are brightly-colored have higher ε values
• c = sample’s concentration
• l = path length (distance between the light source and the detector in a spectrophotometer)
  Note: the standard cuvette used in spectrophotometry has a path length of 1 cm
• Hint: If you know the absorbance of a solution, you can calculate its concentration