The correct sequence of steps for preparing standard solutions of ASA and caffeine is as follows: i. Add (10.000 ± 0.006) mL of the ASA working solution to a volumetric flask of (50.00 ± 0.05) mL, and dilute with solvent. ii. Add (1.000 ± 0.006) mL of the caffeine stock solution to a volumetric flask of (50.00 ± 0.05) mL, and dilute with solvent. iii. Add (0.250 ± 0.003) mL of the caffeine working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. iv. Add (0.500 ± 0.006) mL of the caffeine working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. v. Add (1.000 ± 0.006) mL of the caffeine working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. vi. Add (2.000 ± 0.006) mL of the caffeine working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. vii. Add (3.00 ± 0.01) mL of the caffeine working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. viii. Add (3.00 ± 0.01) mL of the ASA working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. ix. Add (4.00 ± 0.01) mL of the ASA working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. x. Add (5.00 ± 0.01) mL of the ASA working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. xi. Add (6.00 ± 0.01) mL of the ASA working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent. xii. Add (7.00 ± 0.02) mL of the ASA working solution to a volumetric flask of (10.00 ± 0.02) mL, and dilute with solvent.
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