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The densities and viscosities of p-aminophenol in sulfuric acid + water have been determined experimentally at temperatures from (293.15 to 343.15) K. The apparent molar volumes of p-aminophenol were calculated from experimental measurements. Results were fit to obtain the adjustable parameters and standard deviations between the measured and fitted values.

The densities and viscosities of niacin + 3-picoline + sulfuric acid + water mixtures have been determined experimentally at temperatures from 293.15 K to 343.15 K. The apparent molar volumes of niacin were calculated from experimental measurements. Results were fit to obtain the adjustable parameters and standard deviations between the measured and fitted values.

The densities and viscosities of niacin + 3-picoline + water mixtures have been determined experimentally at temperatures from 293.15 K to 343.15 K. The apparent molar volumes were calculated from experimental measurements. Results were fit to obtain the adjustable parameters and standard deviations between the measured and fit values.

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.