A sample weighing 1.25 mg containing a certain compound M (FW 292.16 g/mol) was dissolved in

Question

solvent in a 5.00 mL volumetric flask. A 1.00 mL aliquot was drawn up, placed in a 10.00 mL volumetric and
diluted to the mark with solvent. The absorbance of this solution at 340 nm was 0.427 in a 1.00 cm
cuvette. The molar absorptivity at 340 nm for the compound is 6130 M�]1 cm�]1.
(a) Calculate the concentration of compound M in the 5 mL volumetric flask.
(b) Calculate the percent purity of the compound.

Answer 1

Conc= mass/volume
=1.25/5
=0.25mg/ml