Abstract
The osmotic and activity coefficients of thiourea and 1,3-dimethylthiourea have been determined from isopiestic measurements in aqueous solutions. Osmotic coefficients of these substances in ethylene carbonate solutions have been calculated from freezing-temperature measurements. The results of this and previously reported work enable the following conclusions. The substitution of alkyl groups for hydrogen atoms or sulfur for oxygen in the urea molecule diminishes the osmotic coefficients in aqueous solutions. Micelle formation is suspected as the cause. Urea tends to dimerize in ethylene carbonate while thiourea does not.
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