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All Journal Tadris: Jurnal keguruan dan Ilmu Tarbiyah Pendas : Jurnah Ilmiah Pendidikan Dasar Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Fullerene Journal of Chemistry Oxygenius Journal Of Chemistry Education
Santa, Eldat Wira
Manado State University
Chemistry Education Other

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Sintesis ferrat dari Fe(NO3)3 dan NaOCl sebagai pendegradasi zat pewarna makanan tartrazine Eldat Wira Santa; La Baru Moses
Jurnal Kimia Fullerene Vol 3 No 1 (2018): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.17 KB) | DOI: 10.37033/fjc.v3i1.31

Abstract

This investigation was carried out in order to synthesize ferrate (FeO42-) and was applied to the degradation of the food coloring agent of tartrazine. The synthesis of ferrate is carried out by the reaction of Fe(NO3)3 and NaOCl as oxidants in alkaline conditions. The synthesis was monitored using a UV-Vis spectrophotometer and resulted in a wavelength of 510 nm. The resulting ferrate is crystallized using KCl. The resulting crystals are potassium ferrate of 0.977 g. The angle of potassium ferrate 2q is measured with X-ray diffraction (XRD), which produces an angle of 2q of 28,480. Potassium ferrate was applied to degrade the tartrazine dye that was controlled using the UV-Vis spectrophotometer. The effect of several parameters on the tartrazine dye that degrades the reaction, such as the pH and the molar ratio of ferrate and tartrazine, was also studied in this study. The results showed that ferrate can degrade tartrazine at pH 9.6 with the highest degradation present in the molar ratio of ferrate and tartrazine 1: 5 which is 98.45%. This suggests that ferrate are an alternative and environmentally friendly substance that can be used to degrade tartrazine dye.
Investigating Learners' Conceptual Progression on pH of Solution, Acid-Base Titration, and Buffer Solutions Santa, Eldat Wira; Sumari, Sumari; Nur, Hadi; Setiawan, Nur Candra Eka; Muntholib, Muntholib
Tadris: Jurnal Keguruan dan Ilmu Tarbiyah Vol 9 No 2 (2024): Tadris: Jurnal Keguruan dan Ilmu Tarbiyah
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/tadris.v9i2.23169

Abstract

This study aims to explore the development of understanding of the concepts of pH, acid-base titration, and buffer solutions among 11th-grade students and 2nd- and 4th-semester university students in chemistry education. It employs a cross-sectional design using open-ended questions and interview guidelines to collect data from 153 11th-grade students, 30 second-semester university students, and 40 fourth-semester university students. The open-ended questionnaire consists of 9 items (2 questions on the pH of solutions, 4 questions on acid-base indicators and titration, and 3 questions on buffer solutions and salt hydrolysis) on a continuous scale, with an Aiken's kappa validity of 0.61 (substantial agreement) and a Cronbach's Alpha reliability (KR-20) of 0.75 (acceptable). The results indicate that scientific understanding of pH concepts, such as the pH of solutions, acid-base titration, and buffer solutions, improves with education. However, comprehension of complex concepts remains low. The study's implications highlight the need for curriculum development and the selection and implementation of learning strategies that enable students to learn in a structured, gradual, and coherent manner. Curriculum development should map out subject matter, distinguish essential from non-essential content, and organize material from simple and essential topics to more complex and non-essential ones.
Efektivitas Penerapan Media Pembelajaran PhET Terhadap Hasil Belajar Pada Dimensi Kecerdasan Visual Spasial dan Kecerdasan Logis Matematis Materi Termokimia di SMA Negeri 9 Manado Lumbu, Juliana Loisa Saranita; Gumolung, Dokri; Santa, Eldat Wira
Oxygenius: Journal Of Chemistry Education Vol 7 No 2 (2025): Oxygenius : Journal Of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v7i2.736

Abstract

Penelitian ini bertujuan untuk mengetahui efektivitas penerapan media pembelajaran PhET terhadap hasil belajar siswa pada dimensi kecerdasan visual spasial dan kecerdasan logis matematis dalam pembelajaran kimia pada materi termokimia di SMA Negeri 9 Manado. Penelitian ini menggunakan metode kuantitatif dengan jenis pra-ekperimen dan desain one group pretest-posttest. Instrumen pada penelitian ini yaitu tes dalam bentuk pilihan ganda. Data hasil belajar dianalisis dengan uji normalitas, uji paired sample t-test, uji n-gain, dan uji effect size Cohen. Hasil penelitian untuk uji n-gain menunjukkan rata-rata skor n-gain sebesar 83,16% dan tergolong dalam kategori efektif dengan effect size Cohen sedang sebesar 0,69. Sehingga dapat disimpulkan bahwa penerapan media pembelajaran PhET efektif terhadap hasil belajar siswa pada dimensi kecerdasan visual spasial dan kecerdasan logis matematis dalam pembelajaran kimia pada materi termokimia.
PENGARUH STRATEGI INKUIRI TERBIMBING BERBASIS ISU SOSIOSAINTIFIK TERHADAP LITERASI KIMIA SISWA PADA MATERI IKATAN KIMIA Stevani Rosadelima Kolompoy; Eldat Wira Santa; Joice Dorsila Susana Caroles; Pingkan Pangemanan
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 02 (2026): Volume 11 No. 2, Juni 2026 Release
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i02.44981

Abstract

This study aimed to examine the effect of a guided inquiry strategy based on socioscientific issues on students’ chemical literacy in chemical bonding. The research employed a quantitative approach with a quasi-experimental design in the form of a non-equivalent control group design. The participants consisted of 52 eleventh-grade students divided into an experimental class and a control class, with 26 students in each group. The research instrument was a chemical literacy test consisting of 15 essay items, validated by one Chemistry Education lecturer and one senior high school chemistry teacher. The results of Aiken’s V analysis showed a range of 0.93–1.00 with an average of 0.96 (very valid category), and a reliability coefficient of 0.722 with a significance value of 0.011 (p < 0.05), indicating high reliability. The data were analyzed using paired sample t-tests and an independent sample t-test at a significance level of 0.05. The paired sample t-test results indicated a significant improvement in the experimental class (t(25) = −13.623; p < 0.001) and the control class (t(25) = −8.362; p < 0.001). The independent sample t-test showed a significant difference between the two classes (t(50) = 7.351; p < 0.001) with a mean difference of 8.077. Thus, the guided inquiry strategy based on socioscientific issues significantly affects students’ chemical literacy.
ANALISIS PEMAHAMAN KONSEP MODEL ASAM-BASA PADA SISWA KELAS XI DI SMA NEGERI 1 LANGOWAN Maria Murniyanti Parhusip; Eldat Wira Santa; Anderson Arnold Aloanis; Chintania Sambuaga
Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Vol 9 No 2 (2026)
Publisher : Universitas Islam Kalimantan MAB Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/dl.v9i2.23451

Abstract

Penelitian ini bertujuan untuk mengalisis tingkat pemahaman konsep model asam-basa pada siswa kelas XI di SMA Negeri 1 Langoawan. Pemahaman konsep pada materi model asam-basa masih menjadi tantangan dalam pembelajaran kimia karena cenderung bersifat hafalan. Penelitian menggunakan pendekatan metode mix-methods dengan desain explanatory sequential. Subjek penelitian terdiri dari 92 siswa, dengan 32 informan wawancara yang dipilih secara purposive. Data dikumpulkan melalui tes pemahaman konsep (MCAB) dengan nilai reliabilitas sebesar 0,74 dan wawancara semi-terstruktur, kemudian dianalisis secara deskriptif kuantitatif dan kualitatif. Hasil penelitian menunjukkan rata-rata pemahaman siswa pada tingkat fenomena sebesar 24,58% , inferensi 31,09% , dan ilmiah 44,31%. Pemahaman ilmiah cenderung lebih tinggi, namun secara umum masih belum optimal, dengan pemahaman fenomena sebagai yang terendah. Secara kualitatif, pemahaman dominan berada pada pemahaman inferensi. Temuan ini menunjukkan perlunya penguatan pemahaman konseptual, khususnya pada tingkat pemahaman ilmiah, agar pembelajaran kimia lebih bermakna dan mendalam.
Co-Authors Anderson Arnold Aloanis Chintania Sambuaga Dokri Gumolung Hadi Nur Joice Dorsila Susana Caroles La Baru Moses Lumbu, Juliana Loisa Saranita Maria Murniyanti Parhusip Muntholib Pingkan Pangemanan Setiawan, Nur Candra Eka Stevani Rosadelima Kolompoy Sumari Sumari