Research Article
Acid-Base Indicator Properties of Synthesized Phenylhydrazones: 4-(2-(2,4-Dinitrophenyl) Hydrazono) Methyl)-2 Methoxy Phenol and 4-(2-(2,4-Dinitrophenylhydrazono) Methyl) Benzene-1,3-diol
Table 3
Results showing precision of outcomes from the use of the proposed indicators.
| | Precision parameter | IND-X (mean ± SD; RSD) | IND-Y (mean ± SD; RSD) | | HCl vs. NaOH | CH3COOH vs. NaOH | Assay of ibuprofen | HCl vs. NaOH | CH3COOH vs. NaOH | Assay of ibuprofen |
| | Repeatability | Replicate titrations (n = 6) | 10.01 ± 0.120; 1.20% | 9.88 ± 0.140; 1.42% | 99.66 ± 0.826; 0.83% | 10.69 ± 0.074; 0.69% | 10.49 ± 0.120; 1.14% | 101.0 ± 1.890; 1.87% | | | Different conc. | | | | | | | | | 1. 0.05% w/v | 10.04 ± 0.158; 1.57% | 10.03 ± 0.082; 0.82% | 99.68 ± 0.554; 0.56% | 10.82 ± 0.045; 0.41% | 10.64 ± 0.089; 0.84% | 101.0 ± 1.446; 1.43% | | | 2. 0.10% w/v | 10.02 ± 0.162; 1.62% | 9.80 ± 0.103; 1.04% | 99.32 ± 0.841; 0.85% | 10.64 ± 0.055; 0.51% | 10.50 ± 0.071; 0.67% | 101.0 ± 1.687; 1.67% | | | 3. 0.15% w/v | 10.00 ± 0.141; 1.41% | 10.02 ± 0.079; 0.79% | 99.86 ± 0.410; 0.41% | 10.70 ± 0.071; 0.66% | 10.48 ± 0.045; 0.43% | 100.6 ± 0.909; 0.90% | | Intermediate precision | Different days | | | | | | | | | (1) Day 1 | 10.01 ± 0.120; 1.20% | 9.98 ± 0.092; 0.92% | 100.3 ± 0.585; 0.58% | 10.82 ± 0.045; 0.41% | 10.44 ± 0.055; 0.52% | 101.0 ± 0.477; 0.47% | | | (2) Day 2 | 9.78 ± 0.114; 1.16% | 10.08 ± 0.123; 1.22% | 100.1 ± 0.288; 0.29% | 10.84 ± 0.089; 0.83% | 10.52 ± 0.084; 0.80% | 100.2 ± 1.822; 1.82% | | | (3) Day 3 | 9.94 ± 0.178; 1.79% | 9.90 ± 0.125; 1.26% | 100.1 ± 0.187; 0.19% | 10.76 ± 0.114; 1.06% | 10.50 ± 0.123; 1.17% | 102.4 ± 1.243; 1.21% |
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