Development of Practicum Instructions for Junior High School Students: Formalin Test Using Natural Indicators

Abstract

The purpose of this study was to develop a formaldehyde test practicum instructions using natural indicators for the first high school students. This research method refers to the development procedure developed by Borg and Galls. The trial of 104 leaf and flower crown samples which were estimated to have potential as a natural indicator for formalin testing was carried out. Only 3 natural indicators can be used for drops and filter paper, namely flower: ribosa ruellia, hibiscus rosa-sinensis L and balsamina Impatiens L purpel. Based on the results of the expert assessment and the teacher showed that the practicum instructions were suitable for use by junior high school students to test formalin.

Teaching Acid–Base Fundamentals and Introducing pH Using Butterfly Pea Flower Tea

“…Clitoria ternatea , also known as the butterfly pea flower (BPF), offers an opportunity to address this need since it contains ternatins (a type of anthocyanin). These ternatins exhibit clearly distinguishable color changes at a broad range of pH compared to phenolphthalein, bromophenol blue and natural pigments like turmeric, Hibiscus rosa-sinensis , and Morning Glory. − Typically, anthocyanidins resemble the flavylium cation, which is an aromatic structure composed of three rings containing an oxonium ion. However, this polyphenolic structure is susceptible to oxidation, which can cause the colors to fade.…”

Development of Web-Based Learning Media on Class X Virus Material

“…The utilization of web-based media is one of the latest developments in digital education. Web utilization as learning media is a method to present learning materials by utilizing the internet, including in the form of writing, simulations, and other interactive content [4]. It creates a new learning experience for students, enriching the learning process in a more diverse, dynamic, and creative way, potentially improving their academic achievement [5].…”