Research Article
Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn
Table 4
Effects of the indicator on the interday precision of the method.
| HCl/NaOH (mL) | CH3COOH/NaOH (mL) | Assay of ibuprofen powder (% purity) | Assay of ibuprofen BP tablets (% content) | Day 1 | Day 2 | Day 3 | Day 1 | Day 2 | Day 3 | Day 1 | Day 2 | Day 3 | Day 1 | Day 2 | Day 3 |
| 10.18 | 10.21 | 10.11 | 11.00 | 11.04 | 11.04 | 98.80 | 100.12 | 100 | 96.14 | 96.42 | 98.00 | 10.18 | 10.21 | 10.11 | 11.08 | 11.20 | 11.04 | 99.30 | 99.64 | 99.58 | 95.98 | 97.24 | 98.58 | 10.18 | 10.21 | 10.11 | 11.08 | 11.20 | 11.04 | 98.80 | 99.64 | 99.58 | 98.50 | 97.57 | 97.61 | 10.27 | 10.11 | 10.11 | 11.08 | 11.20 | 11.04 | 99.80 | 99.64 | 99.58 | 98.30 | 97.26 | 98.35 | 10.09 | 10.11 | 10.21 | 11.00 | 11.26 | 11.04 | 99.30 | 100.12 | 100 | 96.00 | 96.77 | 97.30 | 10.09 | 10.11 | 10.21 | 10.90 | 11.20 | 10.93 | 99.80 | 99.64 | 100 | 97.10 | 97.10 | 97.11 | Mean = 10.17 ± 0.068 | Mean = 10.16 ± 0.055 | Mean = 10.14 ± 0.052 | Mean = 11.02 ± 0.072 | Mean = 11.02 ± 0.045 | Mean = 11.02 ± 0.045 | Mean = 99.30 ± 0.447 | Mean = 99.80 ± 0.248 | Mean = 99.79 ± 0.230 | Mean = 97.00 ± 1.160 | Mean = 97.06 ± 0.407 | Mean = 97.83 ± 0.585 | RSD = 0.67% | RSD = 0.54% | RSD = 0.51% | RSD = 0.65% | RSD = 0.66% | RSD = 0.41% | RSD = 0.45% | RSD = 0.25% | RSD = 0.23% | RSD = 1.20% | RSD = 0.42% | RSD = 0.60% | | | | |
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