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All Journal Edumatsains Indonesian Journal of Chemical Connections
Silvia Deswinta Maharani Damanik
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Chemistry Education Mathematics Physics Social Sciences

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Identification of Cation Reaction and Separation of Group I Cations Olena Silvia; Olivia Ghina Olia; Rahma Dika Aulia Nasution; Rani Sakila Nasution; Silvia Deswinta Maharani Damanik
Indonesian Journal of Chemical Connections Vol. 1 No. 1 (2023): Indonesian Journal of Chemical Connections
Publisher : Indonesian Chemical Connections Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.19450013

Abstract

This study focuses on the identification of cation reactions and the separation process of Group I cations in qualitative analysis. The research examines the characteristic reactions of silver, lead, and mercury(I) cations using various reagents. Both dry and wet reaction methods are employed to distinguish and separate these cations from solution mixtures. The results provide a systematic approach for Group I cation identification in laboratory practice.
Comparative Evaluation of Hydrochloric and Acetic Acid Pretreatments for Chicken-Skin Gelatin and Its Application in Edible Films Miftahul Khair; Silvia Deswinta Maharani Damanik
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 11 No 2 (2026): October
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v11i2.8780

Abstract

Chicken skin is a collagen-rich poultry by-product with potential for gelatin production and biodegradable edible films. This preliminary comparative study evaluated gelatin obtained from broiler chicken skin pretreated with 4% hydrochloric acid (HCl) or 3% acetic acid (CH₃COOH) and its application in edible films. Gelatin yield was calculated as the mass of dried gelatin relative to the initial wet weight of chicken skin. The gelatin was characterized using Fourier-transform infrared (FTIR) spectroscopy, and edible films were prepared using 2% gelatin, 1% carboxymethyl cellulose (CMC), and 1 mL glycerol. Based on an initial wet chicken-skin weight of 1,000 g per treatment, the recorded gelatin yields were 5.4% for HCl and 5.6% for CH₃COOH. Both gelatin samples exhibited characteristic Amide A, I, II, and III absorption bands. The HCl-derived film had a thickness of 0.098 ± 0.002 mm and a tensile strength of 29.59 ± 0.34 MPa, whereas the CH₃COOH-derived film had a thickness of 0.104 ± 0.002 mm and a tensile strength of 25.00 ± 0.17 MPa. Both films were transparent, with the HCl-derived film described as slightly rigid and the CH₃COOH-derived film as slightly elastic. However, each acid pretreatment was applied to only one gelatin-extraction batch, and the acid type was confounded with acid concentration. Therefore, the observed differences are descriptive and cannot establish the superiority of either acid treatment. Further studies using independently replicated extractions and standardized treatment conditions are needed to confirm these preliminary findings.
Co-Authors Miftahul Khair Olena Silvia Olivia Ghina Olia Rahma Dika Aulia Nasution Rani Sakila Nasution