Inquiry-Based Worksheet On The Utilization Of Pectin From Lemon Peel Waste As Corrosion Inhibitors To Support Student Understanding In Electrochemistry Concept

Subarkah, Cucu Zenab and Chusni, Muhammad Minan and Gusniar, Optia Wanti and Sundari, Citra Deliana Dewi (2018) Inquiry-Based Worksheet On The Utilization Of Pectin From Lemon Peel Waste As Corrosion Inhibitors To Support Student Understanding In Electrochemistry Concept. International Journal of Pure and Applied Mathematics, 118 (24). pp. 1-15. ISSN 1314-3395

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Abstract

In order to improve the quality of education, construction of a new, alternative experiment worksheet in Basic Chemistry course is needed. Electrochemistry concept, especially corrosion was the main concern of this research because this concept is considered difficult by first year college student. The aim of this research was to produce inquiry based worksheet on utilization of pectin as corrosion inhibitor. Pectin was utilized in this worksheet because it has been known to possess corrosion inhibition properties and environmental-friendly. The method used was 2D (define and design) research and development model. The steps of this research was optimization of experimental procedure, developing the design of the inquiry-based worksheets, and conducting limited test to ten General Chemistry II course students. Pectin was obtained through lemon peel extraction using HCl and ethanol. The rate of corrosion measured on iron plates in HCl 1 M aqueous media. Inhibition efficiency was calculated using weight loss method. Optimum pectin inhibition efficiency was 78%. Validation test of the development of worksheet procedure showed that the worksheet was valid and feasible with rvalue = 0.78 and eligibility percentage = 79.16%. This findings showed that the worksheet is applicable in teaching chemistry on corrosion topic.

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