Citation: Zhang Ya-Ming, Wang Yan-Ru, Shi Jun. Enthalpies of Dilution of Calcium Chloride in Aqueous Solution of Alcohols[J]. Acta Physico-Chimica Sinica, 1994, 10(06): 555-559. doi: 10.3866/PKU.WHXB19940614
English
Enthalpies of Dilution of Calcium Chloride in Aqueous Solution of Alcohols
The enthalpy of dilution of a solution collaining calcium chloride in aqueousmethanol mixture has been determind with LKB-2107 flow microcalorimeter at 298.15 K. The mole fractions of methanol of the mixed solveds x_a were 0.00, 0.24, 0.45, 0.75, 0.87, 0.91, 0.95 and 1.00 respectively. The eaperimental results were correlated with an extended form of the Debye-Huckel equation. Combining with our former works, the enthalpy of dilution at infinite dilution at 0.5 mol·kg~(-1), -ΔH_D~∞ (m=0.5, x_a), for the systems CaCl_2/H_2O-CH_3OH, —C_2H_5OH. -n-C_3H_7OH were calculated. The results obtained indicated that, -ΔH—D~∞ of the three systems change with compositions of the mixed solvent, x_a and thier maximum values are at about 0.87 to 0.95 mole fractions. -ΔH—D~∞ increase with increasing of carbon atom number of alcohols at the same x_a.
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Key words:
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Enthalpy of dilution
- / Calcium chloride
- / Methanol
- / Alcohols
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