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ERIC Number: EJ1442454
Record Type: Journal
Publication Date: 2022-Dec
Pages: 10
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: EISSN-1938-1328
Available Date: N/A
A Multioutcome, Guided Inquiry-Based Liquid-Liquid Extraction Laboratory for Introductory Organic Chemistry
Journal of Chemical Education, v99 n12 p4124-4133 2022
A multioutcome, guided inquiry-based liquid--liquid extraction (LLE) experiment has been designed for introductory organic chemistry. Multiple outcomes were established by identifying a series of red and blue dyes that are (1) soluble in organic solvent, (2) soluble in aqueous solution, or (3) soluble in either the organic or aqueous layers by tuning the pH of the aqueous solution. This series of dyes led to the development of 10 different dye mixtures that can be separated using LLE. In this experiment, students first evaluate the individual solubilities of three assigned dyes under neutral, acidic, and basic biphasic conditions. The colored nature of these dyes allows students to visually follow their solubilities and thus make connections between solubility and the molecular structure, ionization, and acid/base properties of these compounds. Then, students develop a two-step LLE procedure to separate a three-component mixture of their dyes using the observations from their solubility study, and they perform their separation to verify its effectiveness. Student feedback has shown that the visual nature of this lab permitted >90% of students to prepare a successful separation procedure and that students left this lab feeling more confident about LLE. Further, students felt that this guided inquiry-based experiment allowed them to develop laboratory skills, while also improving their understanding of LLE, enhancing their problem-solving and critical thinking abilities, and increasing their engagement and enjoyment in the lab. The ability to diversify the inquiry problem ensures that all students performing this experiment gain the full benefits of conducting inquiry-based learning.
Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A
Author Affiliations: N/A