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- Title
Conductometric Properties of Benzoic Acid, Water and 1-Propanol Mixtures at the Temperatures from 298.15 to 313.15K.
- Authors
KABIR, MD. HUMAYUN; NATH, RANJIT K.; HOSSAIN, MD. KAMRUL; HYDER, M. K. MOHAMMAD ZIAUL
- Abstract
Molar conductance of benzoic acid in 1-propanol-water mixtures has been measured in the composition of 0, 5, 10, 15, 20, 30 and 40 wt % of 1-propanol at 5 K interval from 298.15 to 313.15 K. The limiting molar conductance Λo and the thermodynamic dissociation constant constant pKa were estimated from the measured conductance data using Bray-Kraus and Fuoss-Kraus equations. An approximate linear dependence of pKa with the reciprocal of the dielectric constant of the media was observed and this trend may be due to the dominating effect of the coulombic forces of attractions between the opposite ions over the other types of attractions. The gradual decreases of Λo with the increase of 1-propanol fraction in the binary mixtures of 1-propanol and water may be attributed to relative increase in the viscosities of 1-propanol-water mixtures. The Walden product and normalized Walden product (nwp) of the benzoic acid in the seven binary mixtures have been calculated and a qualitative proposal has been made regarding their variation with wt% of 1-propanol. The free energies of transfer ΔG°tr, also have been computed for the acid in the solvent mixtures. The change of pKa with the solvent composition has been discussed in terms of the free energy of transfer from water to the 1-propanol-water mixtures.
- Subjects
BENZOIC acid; MIXTURES; PERMITTIVITY; ENERGY transfer; WATER transfer; WATER
- Publication
Oriental Journal of Chemistry, 2018, Vol 34, Issue 1, p196
- ISSN
0970-020X
- Publication type
Article
- DOI
10.13005/ojc/340122