The apparent molar volumes of aqueous ammonia, ammonium chloride, aniline and anilinium chloride at 25°C and the volume changes on ionization

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  • RSRh Stokes
    Rh Stokes
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Abstract
The apparent molar volumes of aqueous ammonia, ammonium chloride, aniline and anilinium chloride are measured up to 2 mol l-1 at 25°C by a combination of pyknometric and dilatometric methods. The apparent molar volume f°V of undissociated ammonia at infinite dilution is found to be 24.85±0.02 cm3 mol-1, and that of NH4Cl is 35.71±0.02 cm3 mol-1. The volume change on ionization for the standard states ?V° is -29.07±0.04 cm3 mol-1. For aniline the values are: f°V(PhNH2) 89.30, f°V(PhNH3Cl) 102.74 and ?V° -26.49±0.05 cm3 mol-1.