Abstract
This study proposes a laboratory experiment for undergraduate students based on the comparison of Classical method (Acid-base titration) with Instrumental method (pH metric titration) and response of glass electrode towards dilute solution of acid/base. Current methodology inculcate the students better about the theoretical approach and practical outcomes of pH measurement for a dilute acid/base solution.
Highlights
With the availability of inexpensive glass electrodes and pH meters, most of the laboratory experiments of undergraduate chemistry curriculum are based on pH determination as a tool for quantitative analytical measurements
Classical methods of analysis is one of the upper division under graduate lab courses which is designed to acquaint the students about non-instrumental methods, for quantitative determination
Instrumental methods are considered more reliable than classical methods but in some cases instrumental techniques get fail
Summary
With the availability of inexpensive glass electrodes and pH meters, most of the laboratory experiments of undergraduate chemistry curriculum are based on pH determination as a tool for quantitative analytical measurements. A laboratory experiment is needed to be designed for students in this context to make them understand when they switch from classical method to instrumental one and to teach them better about the deviation of practical pH measurement from theoretical approach for a dilute acid/base system. The classical part of this experiment is the titration of strong acid (HCl) with strong base (NaOH) in the presence of phenolphthalein indicator.
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