Table 3 Empirical parameters a, b and c of Eq. (5) for QUE and 7-HF with NAM of different concentrations in hydro-ethanolic medium and experimental pressure P = 101 kPa
Solvent system | QUE | 7HF | ||||
|---|---|---|---|---|---|---|
\({a\times 10}^{-2}{/\text{m}}^{3}{\text{mol}}^{-1}\) | \({b\times 10}^{-2}{/\text{m}}^{3}{\text{mol}}^{-1}{\text{K}}^{-1}\) | \(c{/\text{m}}^{3}{\text{mol}}^{-1}{\text{K}}^{-2}\) | \({a\times 10}^{-2}{/\text{m}}^{3}{\text{mol}}^{-1}\) | \({b\times 10}^{-2}{/\text{m}}^{3}{\text{mol}}^{-1}{\text{K}}^{-1}\) | \(c{/\text{m}}^{3}{\text{mol}}^{-1}{\text{K}}^{-2}\) | |
30 v/v \(\text{EtOH}\) | 114.5 ± 1.0 | − 0.8 ± 0.0 | 0.1 ± 0.0 | 110.8 ± 0.2 | − 0.8 ± 0.0 | 0.1 ± 0.0 |
30 v/v -\(\text{EtOH}\) + 0.5 NAM | − 214.8 ± 1.2 | 1.3 ± 0.0 | − 0.1 ± 0.0 | 50.6 ± 0.1 | − 0.3 ± 0.0 | 0.1 ± 0.0 |
30 v/v -\(\text{EtOH}\) + 1.0 NAM | − 410.1 ± 1.0 | 2.6 ± 0.0 | − 0.3 ± 0.1 | 103.1 ± 0.4 | − 0.7 ± 0.0 | 0.1 ± 0.0 |
40 v/v \(\text{EtOH}\) | 776.1 ± 2.0 | − 5.2 ± 0.0 | 0.8 ± 0.3 | − 452.0 ± 0.3 | 2.8 ± 0.0 | − 0.4 ± 0.0 |
40 v/v -\(\text{EtOH}\) + 0.5 NAM | 149.7 ± 3.0 | − 1.0 ± 0.0 | 0.2 ± 0.3 | − 216.7 ± 0.5 | 1.3 ± 0.0 | − 0.1 ± 0.0 |
40 v/v -\(\text{EtOH}\) + 1.0 NAM | − 9.15 ± 0.4 | − 0.9 ± 0.0 | 0.0 ± 0.1 | 178.6 ± 0.1 | − 1.3 ± 0.0 | 0.2 ± 0.0 |