Viscosities of aqueous solutions of nitrates ofNa+, K" Mg++, Ca++ and Sr++ were determined by using a thermostated Ubbelohde flow, viscometer in the range of concentrations and temperatures from 20 to SO°c. From the experimental results; lon-Solvent interaction terms (P-Coefficients) were calculated in the concentration range 0.1 to 4M, by using an empirical equation of the form: 11 = 80 exp (hoM + CoM'). It was concluded that the viscosities of these ions in aqueous solutions could be understood in terms of hydration number, charge on the ion and the ionic radius. Ratio of the viscosities of the nitrates and chlorides with common cations were also calculated and interpreted in terms of hydration of cations, anions and ion pair formation.
M A RAZI ,A MUMTAZ ,E A MUKHTAR ,S S SHAH ,H AHMAD ,Y KHAN ,
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