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All Journal JPIn : Jurnal Pendidik Indonesia Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram
Ahmadi Ahmadi
Program Studi Pendidikan Kimia FPMIPA IKIP Mataram
Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Mathematics Physics Other

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Pengaruh Arus Listrik Terhadap Massa Tereduksi Perak Pada Pengendapan Perak Dengan Metode Elektrodeposisi Aldina Putriari; Yeti Kurniasih; Ahmadi Ahmadi
Jurnal Pendidik Indonesia (JPIn) Vol 5, No 1: April 2022
Publisher : Yayasan Pendidikan Intan Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47165/jpin.v5i1.260

Abstract

Logam perak merupakan logam berat yang beracun bila masuk ke tubuh makhluk hidup. Sumber pencemaran logam perak salah satunya berasal dari limbah fixer hasil dari proses fotografi. Diperlukan metode untuk mengambil logam perak tersebut sehingga tidak mencemari lingkungan serta dapat dimanfaatkan kembali secara ekonomis. Salah satu metode yang dapat dilakukan adalah metode elektrodeposisi. Proses elektrodeposisi menggunakan prinsip sistem elektrolisis yaitu menggunakan larutan elektrolit sebagai tempat terjadinya proses perpindahan ion. Penelitian ini bertujuan untuk mengetahui pengaruh arus listrik terhadap massa tereduksi perak pada pengendapan perak dengan metode elektrodeposisi. Berdasarkan hasil penelitian diperoleh arus listrik optimum pada arus 0,04A, dimana dihasilkan massa tereduksi Ag sebesar 41,86% dari penimbangan massa katoda dan 15,33% dari penurunan konsentrasi Ag pada larutan dengan AAS. Aplikasi dari kondisi optimum ini pada limbah foto rontgen diperoleh persen massa tereduksi Ag rata-rata sebesar 17,65% dari penimbangan massa katoda dan sebesar 14,72% dari penurunan konsentrasi Ag pada larutan dengan AAS.
THE EFFECT OF ELECTRIC FLOW ON DECORATIVE KROM ELECTROPLATING WITH COPPER BASE METAL TOWARD CORROSION RATE Ahmadi Ahmadi; Citra Ayu Dewi
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 1, No 2: December 2013
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1000.192 KB) | DOI: 10.33394/j-ps.v1i2.1010

Abstract

In this study a decorative chrome electroplating process has been carried out with a copper base metal, metal electroplating is often used as a means to provide a thin layer on the surface of other metals or substrates using metal which has advantages in terms of property and corrosion resistance. In decorative chrome electroplating nickel and chrome are used as coatings, nickel and chrome are used as coatings because of their protective and decorative properties, protective means they can prevent corrosion and decorative because they look shiny so they look attractive. Copper metal is chosen because of its huge application in the community. This study aims to measure the corrosion rate in copper metal after a decorative chrome electroplating process based on electric current used during the electroplating process. This research is important because during the electroplating process a decorative chrome electoplating technique will be obtained in the form of modules, and the module will be used to train students to increase their skills. This research was conducted in the IKIP Mataram chemical laboratory with a time of one year. The process carried out in this study sequentially is to prepare an electrolyte solution used for electroplating, preparing the copper base metal to be free of oxide or rust, nickel coating and finally coating with chrome. From the coating process carried out then the results will be analyzed the corrosion rate by immersion in NaCl solution at a concentration of 36.05 grams / L for 336 hours, based on variations in electric current used during the electroplating process of 0.5; 1; 1.5; 2; and 2.5 Ampere, the corrosion rate results were 0.029; 0.013; 0.017; 0.022; and 0.012 mm / yr; while the copper metal which is not coated with a corrosion rate is 0.308 mm / yr. Thus it can be concluded that copper metal coated with nickel chrome will effectively resist the lowest rate of corrosion in the current given 2.5 Ampere.
PENGARUH PEMBELAJARAN SAVI BERBASIS MEDIA SIMULASI INTERAKTIF TERHADAP KETERAMPILAN BERPIKIR KRITIS MAHASISWA PADA MATERI ELEKTROKIMIA Citra Ayu Dewi; Ahmadi Ahmadi
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 2, No 1: June 2014
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (518.53 KB) | DOI: 10.33394/j-ps.v2i1.1049

Abstract

Characteristics of electrochemical material that contains abstract concepts. Hence often have difficulty in teaching it. An effective approach as a solution is the SAVI-based interactive learning approach of interactive simulation. Learning SAVI-based interactive media has an animation program that is able to represent abstract concepts in electrochemical materials through visualization and not illustration of the concept in narrative. The purpose of this research is to know the influence of SAVI learning approach to students' critical thinking skill in electrochemical material. The type of research used is quasi-experimental research. The research design used is posttest only control group design. The sample was divided into two groups: experiment and control group. The research instrument uses critical thinking skill test through rubric. The results show that the SAVI approach has a positive effect on critical thinking skills compared to conventional methods. We conclude that the SAVI learning approach has been able to improve students' critical thinking skills.
Co-Authors Aldina Putriari Citra Ayu Dewi Yeti Kurniasih