# Contoh Soal Iodometri Dan Iodimetri

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• January 2021
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Conto Soal

Soal Iodimetri • 10ml injeksi natrium tiosulfat ditambahkan HCL encer hingga pH lebih kurang 7, lalu di encerkan dengan air secukupnya hingga lebih kurang 20ml. Setelah di titrasi menggunakan indikator kanji ternyata memerlukan 40,20ml larutan iod 0,1N. • Berapa %b/v NA2SaO3.5H2O dalam injeksi natrium tiosulfat itu 1 ml 0,1 N setara dengan 24,82 mg NA2SaO3.5H2O

Jawab : • Jawab : — 2Na2S2O3 + I2

2NaI + Na2S4O6

Mg natrium tiosulfat = 40,20 x 24,82mg = 997,8 mg = 0,9978 g — %b/v NA2SaO3.5H2O = 0,9978/10 x 100 = 9,978%

Soal Iodometri • Pada pembuatan Na2SO3 : Larutan iodin 15 ml 0,1 M dimasukkan ke Erlenmeyer, tambahkan beberapa tetes indicator amilum, titrasilah dengan larutan Na2SO3 sampai tidak berwarna (didapatkan V Na2S2O3 = 22 ml). Kemudian 20 ml CuSo4 + 5 ml H2SO4 2 M + 0,5 gram KI, campuran berwarna kuning + larutan kanji / indicator amilum perlahan sampai warna keunguan. Titrasi dengan Na2S2O3 sampai warna ungu tersebut menghilang (didapatkan V Na2S2O3 = 8,5 ml). Tentukanlah kadar CuSo4 ?

Diketahui : • Pembuatan Na2S2O3: V I2 = 15 ml M I2 = 0,1 M V Na2S2O3 = 22 ml

• Penentuan kadar Cu: V CuSO4 = 20 ml V H2SO4 = 5 ml M KI = 0,5 gr M H2SO4 = 2 M V larutan kanji = 4 ml (80 tetes) V Na2S2O3 = 8,5 ml

Jawab : • Standarisasi Na2S2O3 terhadap I2 V1.N1 = V2.N2 15 x 0,1 = 22 x N2 N2 = 1,5/ 22 = 0,07 N

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