Reaksi Warna Alkohol
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REAKSI-REAKSI PENDAHULUAN GOLONGAN ALKOHOL PRINSIP DAN REAKSI Golongan fenol adalah senyawa yang memiliki paling tidak satu gugus hidroksil yang terikat pada rantai alifatik. Prinsip reaksi identifikasi untuk golongan alkohol Reaksi esterfikasi terbentuk ester jika ditambahkan asam karboksilat yang dapat diamati dari aromanya. R 1 OH R COOH + R COOR 1 BAHAN DAN ALAT Pelat tetes, tabung reaksi, penjepit kayu, pembakar bunsen Sampel etanol, gliserin, mentol, Etanol (CH 3 CH 2 OH) BM 46,07 Titik didih 78 o C Cairan tidak berwarna, jernih, higroskopik, mudah terbakar, mudah menguap. PROSEDUR 1. Menggunakan tabung reaksi, masukkan 1 ml etanol. Tambahkan asam salisilat atau asam benzoat, kemudian perlahan-lahan melalui dinding tabung, tambahkan H 2 SO 4 . Tutup mulut tabung dengan sumbat kapas. Panaskan di atas penangas air. Amati aroma pada penutup kapas. 2. Menggunakan tabung reaski, Lakukan reaksi iodoform. Amati aroma hasil reaksi 3. Menggunakan tabung reaksi, tambahkan larutan jenuh K 2 Cr 2 O 7 jenuh dalam H 2 SO 4 50%. Amati perubahan yang terjadi. PENGAMATAN NO REAGENSIA PENGAMATAN 1 Esterfika si 2 Iodoform 3 K 2 Cr 2 O 7 REAKSI
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Transcript of Reaksi Warna Alkohol
REAKSI-REAKSI PENDAHULUANGOLONGAN ALKOHOL
PRINSIP DAN REAKSIGolongan fenol adalah senyawa yang memiliki paling tidak satu gugus hidroksil yang terikat pada rantai alifatik. Prinsip reaksi identifikasi untuk golongan alkohol
Reaksi esterfikasi terbentuk ester jika ditambahkan asam karboksilat yang dapat diamati dari aromanya.
R1 OH R COOH+ R COOR1
BAHAN DAN ALATPelat tetes, tabung reaksi, penjepit kayu, pembakar bunsenSampel etanol, gliserin, mentol,
Etanol (CH3CH2OH) BM 46,07 Titik didih 78oC
Cairan tidak berwarna, jernih, higroskopik, mudah terbakar, mudah menguap. PROSEDUR
1. Menggunakan tabung reaksi, masukkan 1 ml etanol. Tambahkan asam salisilat atau asam benzoat, kemudian perlahan-lahan melalui dinding tabung, tambahkan H2SO4. Tutup mulut tabung dengan sumbat kapas. Panaskan di atas penangas air. Amati aroma pada penutup kapas.
2. Menggunakan tabung reaski, Lakukan reaksi iodoform. Amati aroma hasil reaksi
3. Menggunakan tabung reaksi, tambahkan larutan jenuh K2Cr2O7 jenuh dalam H2SO4 50%. Amati perubahan yang terjadi.
PENGAMATAN
NO
REAGENSIA PENGAMATAN
1 Esterfikasi
2 Iodoform
3 K2Cr2O7
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Gliserin (C3H8O3) BM 92,05 Jarak lebur 0-20oCCairan yang tidak berwarna, kental, dan berasa manis.
CH2OH
HOHC
CH2OH
Struktur kimia gliserol
PROSEDUR1. Campurkan larutan gliserin dengan 1 tetes CuSO4 dan basakan dengan
NaOH. Amati perubahan warna yang terjadi.2.
PENGAMATAN
NO
REAGENSIA PENGAMATAN
1CuSO4 + NaOH
2
3
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Mentol (C10H20O) BM 156,27 Jarak lebur 43-44oCSerbuk kristal putih, aroma pepermin, rasa dingin.
OH
Struktur Kimia Mentol
PROSEDUR1. Letakkan mentol di atas pelat tetes. Amati aromanya.2. Menggunakan pelat tetes, tambahkan H2SO4 dan salisilaldehid. Amati
perubahan warna yang terjadi.
PENGAMATAN
NO
REAGENSIA PENGAMATAN
1
2
3
4
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Resorsinol (C6H6O2) BM 110,1 Jarak lebur 109-112oCSerbuk kristal putih, menjadi merah jika terkena cahaya.
PROSEDUR1.
PENGAMATAN
NO
REAGENSIA PENGAMATAN
1 p-DAB
2 FeCl3
3 Lieberman
4 Ag(NH3)NO3
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