Solubilities of p-Aminophenol in Sulfuric Acid + Water from (286.15 to 362.80) K

Abstract

Using a laser monitoring observation technique, the solubilities of p-aminophenol in sulfuric acid + water have been determined experimentally from 286.15 K to 362.80 K. The experimental data were correlated with the modified Apelblat equation. The calculated results showed good agreement with the experimental data.

Solubility of Isonicotinic Acid in 4-Methylpyridine + Water from (287.65 to 361.15) K

“…respectively. The temperature dependence of isonicotinic acid solubility at fixed solvent composition is described by the modified Apelblat equation [8][9][10] ln…”

Solubilities of p-Aminophenol in Sulfuric Acid + Water + (Methanol, Ethanol, 1-Propanol, 2-Propanol, 1,2-Propanediol, and Glycerin, Respectively) from (292.35 to 348.10) K

“…By using the data shown in Table 1, T-x curves for p-aminophenol + sulfuric acid + water + alcohols system [i.e., the p-aminophenol + sulfuric acid + water + (methanol, ethanol, and 1-propanol, respectively) systems as shown in Figure 2, p-aminophenol + sulfuric acid + water + (1-propanol, 1,2-propanediol and glycerin respectively) systems as shown in Figure 3, and p-aminophenol + sulfuric acid + water + (1-propanol and 2-propanol respectively) systems as shown in Figure 4] were plotted. For comparison, the T-x curves for p-aminophenol + sulfuric acid + water based on the literature values 14 were also drawn in every figure . From Figure 2 it can be found that, for the mixed solvent systems containing normal monohydric alcohol, the solubility of p-aminophenol increases with the increase of the carbon atom numbers of the alcohols at constant temperature. From Figure 3 it can be known that, for the mixed solvent systems containing 1-propanol, 1,2-propanediol, and glycerin, respectively, which all contain three-carbon atoms, the solubility of p-aminophenol in the mixed solvents decrease with the increase of hydroxyl group numbers of the alcohols at constant temperature.…”

“…Due to the associations, the interaction intensity between A-B is far weaker than that between A-A or B-B, so the solubility of p-aminophenol in water is very low. 14 With the adding of sulfuric acid in the system, a stronger interaction between the alkaline -NH 2 group in p-aminophenol molecule and the H + in the solution occurs, which makes the solubility of p-aminophenol in the mixed solvent increase obviously.…”

“…Reproducibility of measurements was 0.1 K, which corresponds to a relative deviation in composition smaller than 1 %. To verify the reliability of the measurement, the authors 14 had measured the solubility data of p-aminophenol in water using the same apparatus and procedure. The result showed that the deviations of the measured solubility from the literature values 11,14 are less than 2 %.…”

“…To verify the reliability of the measurement, the authors 14 had measured the solubility data of p-aminophenol in water using the same apparatus and procedure. The result showed that the deviations of the measured solubility from the literature values 11,14 are less than 2 %. In this work, the uncertainty for solubility measurement is estimated based on the principle of the error propagation and found to be within ( 1 % at the 95 % confidence level.…”