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Densities and viscosities of aqueous solutions of urea and guanidine hydrochloride at 25° have been measured, and equations are presented which describe their variation with concentration. Densities and viscosities of similar solutions containing additional solutes (buffers, NaCl, β-mercaptoethanol) have been measured, and the possibility of predicting these results from information on solutions containing each solute separately is discussed.
Kawahara et al. (Fri,) studied this question.