Tuesday 9 July 2013

ANALISIS KADAR ALKOHOL METODE OKSIDASI DIKROMAT DALAM SUASANA ASAM


Tujuan                         : Menentukan kadar alcohol dalam bahan pangan.
Prinsip                         : Reaksi oksidasi dikromat oleh alcohol dalam suasana asam.

Alat dan Bahan           :
Alat
·         Labu ukur
·         Erlenmeyer]tabung reaksi
·         Waterbath
·         Vortex mixer
·         Pipet ukur
·         Pipet tetes
Bahan
·         Kalium kromat ditimbang 33,768 gram dilarutkan dalam akuades lalu ditambahkan secara perlahan 325 mL asam sulfat pekat, dan tepatkan dengan akuades sampai tandabatas dalam labu ukur 1000 mL.
·         Alcohol absolut
·         Sampel
·         Akuades
Prosedur                      :
A.    Penentuan Sampel
1.      Mereaksikan 0,5 mL sampel, 15 mL akuades, 12,5 mL larutan kalium dikromat kedalam Erlenmeyer 50 mL, kocok.
2.      Larutan yang terbentuk diambil 10 mL masukkan ke dalam labu ukur 25 mL, kemudian panaskan pada waterbath dengan suhu 62,50C selama 20 menit.
3.      Dinginkan pada suhu ruang.
4.      Larutan yang sudah dingin, tambahkan akuades sampai tanda batas hingga volume 25 mL, kemudian kocok. ,5 mL larutan dipindahkan ke dalam tabung reaksi dan tambahkan 2,5 mL akuades.
5.      Kocok dengan vortex mixer dan uji sampel dengan spektrofotometer pada panjang gelombang 600 nm. Warna larutan berubah warna dari jingga menjadi hijau.

B.     Pembuatan Kurva Baku
1.      Buatlah kurva baku dengan larutan alcohol dengan konsentrasi 2%, 4%, 6%, 8%, 10% dan 12%.
2.      Lakukan prosedur seperti penetapan sampel dengan mengganti ampel dengan larutan baku alcohol.


1 komentar:

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