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Sabtu, 10 Desember 2011

Penetapan Kadar Yodium Pada Garam Dapur

Praktek Kimia AMAMI
Penetapan Kadar Yodium Pada Garam Dapur

Tujuan : 
Untuk mengetahui kadar yodium dalam garam dapur

Metode : Titrimetri Iodometri

Dasar Teori : 
dalam tubuh terkandung 25mg yodium yang tesebar dalam semua jaringan tubuh, kandungan yang paling tinggi yaitu sepertiga terdapat didalam kelenjar tiroid dan yang relatif lebih tinggi adalah ovaari otot dan darah.

Reagen : 
Orthoposfat 85% 
larutan amylum
larutan KI
larutan Natrium Thiosulfat

Cara kerja :
·         Timbang 5gr sampel, masukkan dalm erlenmeyer
·         Tambahkan aquadest sebanyak 50ml dan 20ml orthoposfat 85%
·         Kemudian periksa pH sampai < 6, aduk selama 2 menit
·         Tambahkan larutan KI 30% sebanyak 5 ml
·         Tambahkan 3 tetes indikator amylum 1%
·         Titrasi dengan larutan Natrium Thiosulfat samapai warna biru tepat hilang. Catat voleme titrasinya (Lakukan pengerjaan secara duplo)



Rumus Perhitungan :
Vol.titrasi x N.Na2S2O3 x 0,89 x 1000  = .... Kadar KIO Mg / Kg
                Berat Sampel

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