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All Journal Walisongo Journal of Chemistry Indonesian Journal of Chemical Science and Technology CHEDS: Journal of Chemistry, Education, and Science
Wardana, Dian
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology

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Effect of Organic and Inorganic Compounds on the Conductivity of Salt Solutions Safitri, Wulan Dwi; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an; Zubir, Moondra; Purba, Sunita Karin; Puandra, Esti Miska; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70635

Abstract

This study examines the effects of selected organic and inorganic compounds on the electrical conductivity of salt solutions. Organic substances (sugar, coffee, tea, and a surfactant-based cleaner) and inorganic additives (ammonium chloride in cough medicine, povidone–iodine, and carbonated beverage) were mixed with salt solutions at varying concentrations to evaluate their influence on ion availability and mobility. The results show that conductivity increases proportionally with salt concentration, confirming that ion content is the primary factor governing charge transport. Inorganic ionic additives significantly enhanced conductivity by releasing additional ions into the solution, whereas non-ionic organic compounds consistently reduced conductivity at low salt levels by diluting ionic species and hindering ion mobility. Conductivity in organic mixtures increased only when salt concentration became dominant. These findings highlight the contrasting mechanisms of organic and inorganic additives in modifying electrolyte behavior and provide useful insight for chemistry education and simple electrochemical analysis.
Analysis of the Effect of Varying Concentrations of Strong Acids (HCl) and Weak Acids (CH3COOH) with Mixing of Bases (Detergent) on the Temperature Increase of the Reaction Results Fahmi, Jam'an; Ramadhan, Dwi Sapri; Wardana, Dian; Safitri, Wulan Dwi; Zubir, Moondra; Siregar, Nurdin; Br Sebanyang, Resi Mai Linda Etaminta; Br Napitupuli, Monika Shinta Kasih; Lumbantoruan, Sifra H.R
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70670

Abstract

Neutralization reactions between acids and bases are generally exothermic processes that release heat because of water formation from H⁺ and OH⁻ ions. This study aims to investigate the effect of varying concentrations of a strong acid (HCl) and a weak acid (CH₃COOH) on the temperature increase produced when these acids are reacted with a detergent-based alkaline material. Experiments were conducted using three acid concentrations—0.1 M, 0.3 M, and 0.5 M—each mixed with 3 g, 5 g, and 7 g of detergent in a reaction volume of 25 mL. The results indicate that increasing acid concentration correlates positively with greater temperature elevation. The largest temperature increase, 5.7°C, was observed in the reaction between 0.5 M HCl and 7 g of detergent, whereas the lowest increase, 0.5°C, occurred in the reaction between 0.1 M CH₃COOH and 3 g of detergent. Differences in ionization strength between strong and weak acids significantly influence the amount of heat released during neutralization. These findings demonstrate that both acid strength and base mass play important roles in determining the exothermic energy output of acid–base reactions.
PENERAPAN MEDIA PEMBELAJARAN BERBASIS WEBSITE MENGGUNAKAN MODEL KOOPERATIF TIPE SCRAMBLE PADA MATERI HIDROLISIS GARAM Safitri, Wulan Dwi; Eddiyanto, Eddiyanto; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.11838

Abstract

Fokus penelitian ini adalah untuk menentukan peningkatan hasil belajar siswa di kelas eksperimen setelah diajar menggunakan media pembelajaran berbasis web dengan model kooperatif tipe scramble pada materi hidrolisis garam. Instrumen yang digunakan adalah 20 pertanyaan objektif. Dari hasil analisis, rata-rata peningkatan siswa kelas eksperimen adalah 0,7414 (kategori tinggi) dan di kelas kontrol adalah 0,5881 (kategori sedang). Berdasarkan hasil uji hipotesis dengan uji t sisi kanan, ditemukan bahwa t hitung lebih besar dari t tabel atau 8,064 2,0021 dengan tingkat signifikansi α = 0,05, sehingga Ha diterima, sehingga peningkatan hasil belajar di kelas yang diajar menggunakan media pembelajaran berbasis web lebih tinggi daripada peningkatan hasil belajar di kelas yang diajar tanpa menggunakan media pembelajaran berbasis web (konvensional).
COMPARATIVE GC–MS CHARACTERIZATION AND PHYSICOCHEMICAL EVALUATION OF Citrus hystrix DC. ESSENTIAL OILS FROM DIFFERENT PLANT PARTS Ramadhan, Dwi Sapri; Warsito, Warsito; Azzahra, Vina Octavia; Wardana, Dian; Fahmi, Jam’an; Safitri, Wulan Dwi
Walisongo Journal of Chemistry Vol. 8 No. 2 (2025): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v8i2.28063

Abstract

Essential oils from Citrus hystrix DC. are known for their rich bioactive composition, particularly citronellal, which has extensive applications in the fragrance and pharmaceutical industries. However, comparative studies on the chemical and physicochemical properties of oils extracted from different plant parts remain limited. This study investigated essential oils obtained by steam distillation from leaves (LEO), twigs (TEO), and a leaf–twig mixture (LTMEO). The oils were characterized using GC–MS and FTIR analyses, alongside measurements of density, refractive index, and yield. LTMEO yielded a yellow, aromatic oil with a density of 0.856 g/mL, a refractive index of 1.439, and a yield of 0.60%, consistent with the quality requirements of SNI 9231:2023. GC–MS profiling identified citronellal as the dominant compound, with concentrations of 83.88% in LEO, 69.88% in LTMEO, and 46.47% in TEO. FTIR spectra confirmed the presence of aldehyde functional groups, consistent with the high citronellal content. Minor constituents such as linalool (5.24–8.91%), isopulegol (0.47–2.95%), β-citronellol (2.03–12.22%), and citronellyl acetate (4.28–6.48%) were also detected, potentially affecting citronellal isolation. Overall, the findings highlight C. hystrix DC. leaves as the most promising source of citronellal for industrial applications.
Co-Authors Ahmad Nasir Pulungan Aulia, Amanda Ayu Andini ayumi, Sheilla Maliza Azzahra, Vina Octavia Br Nadeak, Stephani Bintang N. Br Napitupuli, Monika Shinta Kasih Br Sebanyang, Resi Mai Linda Etaminta Br Sipahutar, Desy Meriani Damanik, Angelica Damanik, Wicha Rosari Eddiyanto Eddiyanto Everyanti, Ida Cathy Fahmi, Jam'an Fahmi, Jaman Fahmi, Jam’an Husna, Wiki Nadia Irma Syahputri Limbong, Julian Lubis, Ghania Dhia Ulhaq Lumbantoruan, Sifra H.R Manalu, Anrian Haholongan Manullang, Okto Panca Manullang, Riska Greselia Mendrofa, Bulan Susanti Moondra Zubir Nainggolan, Lidya Revalina Nasution, Dhea Ananda Nurdin Siregar Puandra, Esti Miska purba, Gracia Purba, Sunita Karin Putri Ayunicha Rahmadyani, Zaskia Ramadhan , Dwi Sapri Ramadhan, Dwi Sapri S, Abd Hakim Safitri, Wulan Dwi Sagala, Novitri Yolanda Shallomita, Grace Sigalingging, Olivia Gina Ananta Sihotang, Pelita Silalahi, Sarina Septiani Simamora, Astuty Evalina Simamora, Elisabeth Siregar, Ida Cathy Everyanti Siregar, Koriatul Jannah Siregar, Nuraini Tambunan, Ida Mariati Warsito Warsito Zubir, Moondra