Captopril (90 mg, 70% assay) was dissolved in 25 ml of solvent to prepare solution A. Working: 500 uL from A in 25 mL flask. The std curve was prepared by pipetting 1, 3, and 6 mL of working to three- 25 mL flasks. QC sample was prepared by pipetting 4.5 mL of working to a 25 mL flask. (Answers with 5 decimal points) Stock (mg/mL) Working Std1 Std2 Std3 QC (mg/mL) ng/mL ng/mL ng/mL ng/mL Std curve 30 y = 0.0076x + 2.169, R2 = 0.9321 25 %3! 20 15 10 0.0 1000.0 2000.0 3000.0 4000.0 Relative recovery QC (ng/mL) AD AIS 6000 125 5212 200 4115 175 5.