We modified an isoperibol calorimeter (Thermometric LKB8700) to a titration calorimeter for 1P-Probing methodology and applied it to sodium citrate aqueous solution. The results showed that citrate acts as a hydration center with the hydration number of citrate as 11.2. In addition, the hydrogen bond probability of bulk water away from hydration shells seems to decrease on increasing 1P.
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Fig.1 Effects of sodium salts on the concentration dependence pattern of HE1P–1P. |
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Fig.2 Concentration dependence of HE1P in sodium citrate aqueous solution. |
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Fig.3 Concentration dependence of HE1P–1P in sodium citrate aqueous solution. |
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Fig.4 The value of x1P of point X vs. initial concentration of sodium citrate aqueous solution. Dotted line shows the contribution of three sodium ions. |