59. Solving a chemistry problem

5. V ml of a solution containing picramic and picric acids was placed in a separating funnel, the necessary reagents were added, including a solution of a cationic red-violet dye, which allows extracting picric acid into a layer of benzene. When extracting 2.00 ml of benzene and measuring the optical density of the organic extract, Ax
Calculate the concentration of picric acid in solution (mg/l) using the following data:
Option 1
V, ml ............................. 10.0
Ax....................... 0.480
To build a calibration graph, one should use the data obtained during extraction under the same conditions of a solution containing 1.10 μg / ml of picric acid:
Vst....................... 1.50 3.50 5.50 7.50 9.50
Ast…………………………. 0.180 0.360 0.620 0.780 1.00
Answer: 1) 0.50 mg/l;