ERIC Number: EJ1033343
Record Type: Journal
Publication Date: 2014-Jul
Abstractor: As Provided
Reference Count: 6
Undergraduate Analytical Chemistry Experiment: The Determination of Formation Constants for Acetate and Mono-and Dichloroacetate Salts of Primary, Secondary, and Tertiary Methyl-and Ethylamines
D'Amelia, Ronald P.; Chiang, Stephanie; Pollut, Stephanie; Nirode, William F.
Journal of Chemical Education, v91 n7 p1070-1072 Jul 2014
The formation and the hydrolysis of organic salts produced by the titration of a 0.1 M solution of the following amines: methyl-, dimethyl-, trimethyl-, ethyl-, diethyl-, and triethylamine with a 0.1 M solution of acetic, chloroacetic, and dichloracetic acids are studied. The pK[subscript b] of the amine and the pH at the end point were determined for each reaction from the corresponding titration curve. The experimentally determined values were in very good agreement with the literature and calculated values. The salt formation constants (K[subscript sf]) for acetate and mono-and dichloroacetate salts of primary, secondary, and tertiary methyl- and ethylamines were also determined. The conclusions were as follows: (1) the pH at the end point decreased as the strength of the titrating acid increased, (2) the stronger the amine base, the higher the pH at the end point, and (3) the K[subscript sf] increased with increasing acid and base strength.
Descriptors: Science Instruction, Undergraduate Study, College Science, Chemistry, Science Experiments, Scientific Concepts, Science Laboratories, Teaching Methods, Laboratory Experiments
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Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A