Determination of the Ionization Constants of Methylamine, Ethylamine, and Triethylamine an Aqueous Solutions at Different Temperatures using Conductance Measurements

Mostafa M. Emara, Hassan A. Shehata*, Hassan M. Abd-El Bary and Mohamed S. Abd. El-Samad

Department of Chemistry, Faculty of Science, Al-Azhar University*, Nasr City, Cairo Egypt.

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ABSTRACT:

The ionization constants "Kb" for aqueous methyl, ethyl, and triethyl amines were determined at different temperatures using conductometric method. It is found the ionization process decreases in the order methyl > ethyl > triethyl amines* Kb was found to increase with temperature for the three systems with temperature coefficient ( -d(PKb)/dT ), of+0.032 unit/°C. This, of course, indicates that the ionization process in the three systems are endothermic one. Other thermodynamic parameters such as ΔH0, ΔS° and ΔG° are calculated. The results are discussed in view of their structure.

KEYWORDS:

Determination; Constants; Ethylamine