Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn

Table 3

Evaluation of repeatability.

HCl/NaOH (mL)	CH3COOH/NaOH (mL)	Assay of ibuprofen powder (% purity)	Assay of ibuprofen BP tablets (% content)
10.18	11.00	98.80	97.30
10.18	11.08	99.30	96.78
10.18	11.08	98.80	95.53
10.27	11.08	99.80	97.10
10.09	11.00	99.30	96.82
10.09	10.90	99.80	97.25
10.18	10.90	99.80	97.82
10.18	11.00	99.80	97.87
10.18	11.00	99.80	96.80
10.18	11.00	99.80	97.67
10.18	11.08	99.30	96.90
Mean = 10.17 ± 0.049	Mean = 11.01 ± 0.067	Mean = 99.48 ± 0.405	Mean = 96.64 ± 0.653
RSD = 0.48%	RSD = 0.61%	RSD = 0.41%	RSD = 0.68%