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Siti Jahro, Iis
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SINTESIS DAN KARAKTERISASI SENYAWA ION Mg(OH)2 DENGAN METODE PENGENDAPAN Nurul Ilma Pohan, Nadiya; Sakinahdyah Harahap, Balqis; Krisdayanti Purba, Hendike; Maida Aritonang, Tiur; Siti Jahro, Iis
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 01 (2026): Volume 11 No. 01 Maret 2026 Public
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i01.44077

Abstract

This study aims to synthesize and characterize magnesium hydroxide (Mg(OH)₂) using the precipitation method. The experiment was conducted by reacting magnesium chloride (MgCl₂) and sodium hydroxide (NaOH) solutions under controlled laboratory conditions. The synthesis produced a white precipitate of Mg(OH)₂ with a mass of 1.60 grams after filtration, washing, and drying. Characterization included physical observation, solubility testing, and pH measurement. The results showed that Mg(OH)₂ is a white solid with low solubility in water but dissolves in hydrochloric acid (HCl) due to neutralization reactions. The measured pH was around 9, indicating that Mg(OH)₂ is a weak base. These findings are consistent with theoretical concepts of ionic compounds, solubility equilibrium, and precipitation reactions. Therefore, the precipitation method is effective for synthesizing Mg(OH)₂ and supports the relationship between theoretical and experimental understanding in inorganic chemistry.
SINTESIS DAN KARAKTERISASI SENYAWA KOMPLEKS TETRAMMINETEMBAGA(II) SULFAT [CU(NH3)4]SO4 Fardaniah, Raziqah; Si’arif Hidayat Daeli; Ari Ramadana; Mustika Anjani Hutagaol, Sari; Siti Jahro, Iis
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.v11i02.44310

Abstract

This study aimed to synthesize and characterize the complex compound tetraamminecopper(II) sulfate [Cu(NH₃)₄]SO₄ based on coordination chemistry principles. The research was conducted using a laboratory experimental method with a simple experimental design. The synthesis was carried out by reacting copper(II) sulfate pentahydrate with concentrated ammonia, followed by the addition of ethanol to induce crystallization and cooling using an ice bath. The resulting crystals were filtered, washed, and dried before further characterization. Data were collected through direct observation of color changes, crystal formation, and solubility behavior, as well as mass measurement to determine the yield. The results showed that the synthesis produced dark blue crystals with a mass of 1.21 g and a yield of 53.1%. The formation of the complex was indicated by a color change from light blue to deep blue due to ligand substitution from water to ammonia. Solubility tests revealed that the compound was soluble in polar solvents (H₂O and NH₄OH) and insoluble in nonpolar solvents (CHCl₃ and ethanol), confirming its ionic and polar nature. These findings were consistent with coordination chemistry theory, indicating that the synthesized compound possessed the expected structural and physicochemical properties.
Co-Authors Ari Ramadana Fardaniah, Raziqah Krisdayanti Purba, Hendike Maida Aritonang, Tiur Mustika Anjani Hutagaol, Sari Nurul Ilma Pohan, Nadiya Sakinahdyah Harahap, Balqis Si’arif Hidayat Daeli