Why do we produce a "blank" solution (standard number 1) that does not contain any salicylic acid?

A calibration curve (indicated by the line of best fit, shown below) has been prepared to determine the concentration of a sample. Use the calibration curve below to determine the concentration of an unknown sample that has an absorbance of 0.65.

What region of the electromagnetic spectrum is 540 nm?

Given that A is absorbance; ε is molar absorptivity; c is molar concentration and b is path length of the cell (cm), which of the following describes the Beer-Lambert law?

Determine the correct units for the molar absorptivity, ε, using the Beer-Lambert law, A=εcl, (absorbance has no units, concentration units are mol L^-1 and cell length is in cm).

Identify the functional groups present in Aspirin®,