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PERTUMBUHAN CABAI RAWIT SEBAGAI PENGEMBANGAN MODUL PEMEBELAJARAN KIMIA Meta Aprizul; Jejem Mujamil; K. Anom W
Jurnal Penelitian Pendidikan Kimia: Kajian Hasil Penelitian Pendidikan Kimia Vol 8, No 1 (2021)
Publisher : Chemistry Education Study Program Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jppk.v8i1.15253

Abstract

Penelitian yang bertujuan untuk menghasilkan Modul Pembelajaran Kimia Terintegrasi STEM-PBL Mata Kuliah Kewirausahaan Topik Pupuk Organik Untuk Pertumbuhan Cabai Rawit yang valid, praktis dan efektif. Model pengembangan yang digunakan adalah model ADDIE (Analysis, Design, Development, Implementation, Evaluation) yang dikombinasikan dengan evaluasi formatif tessmer. Pada atahap expert review menghasilkan rata-rata nilai koefisien Aiken sebesar 0,942 dengan kategori tinggi. Rata-rata nilai uji one to one memperoleh nilai 91,27% dengan kategori sangat praktis dan uji small group memperoleh nilai 94,91% dengan kategori sangat praktis. Hasil uji field test didapatkan skor rata-rata 0,76 dengan kategori tinggi. Hasil penelitian menunjukkan bahwa modul yang dihasilkan telah memenuhi kriteria valid, parktis dan efektif.
STUDI PEMISAHAN Co(II), Cu(II), Fe(III) DAN Ni(II) SECARA EKSTRAKSI PELARUT DENGAN ZAT PENGKOMPLEKS NATRIUM DIETILDITIOKARBAMAT Soefjan Tsauri; K. Anom W; Buchari Buchari
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v3i1.278

Abstract

Sodium diethyldithiocarbamate (NaDDC) as a chelating agent reacts unselectively with cobalt(II), copper(II), iron(III) and nickel(II). Their maximum wavelengths are very similar in carbon tetrachloride solution and hence these complexes could not be determined by UV/VIS spectrophotometer without prior separation. A scheme of separation has been found for qualitative analysis of cobalt(II), copper(II), iron(III) and nickel(II) at a certain pH using a specific masking agent. It was found that pH 9 turned out to be the best condition for iron(III) masking but neither for cobalt(II), nor for copperill] and nickel(II). The addition of 10 mL HCI 12 N to the complex solutions of Co(II), Cu(II) and Ni(II) would remove Cu(II) and Ni(II) complexes from CC14 to water phase whereas Co(II) complex was still in the CCl4 phase. Cu(II) and Ni(II) ions in the water phase were then treated with 10 mL Titriplex 8,66 x 10-5 mole at pH 9 in which Ni(II) was masked but not Cu(II).