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Campuran Cairan

Campuran Cairan. Fungsi pencampuran Ideal Fungsi Gibbs Pencampuran: ∆G mix = nRT (x A ln x A + x B ln x B ) n = n A + n B Fungsi kelebihan S E = ∆S mix + nR (x A ln x A + x B ln x B ). SIFAT KOLIGATIF.

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Campuran Cairan

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  1. Campuran Cairan • Fungsi pencampuran Ideal • Fungsi Gibbs Pencampuran: • ∆G mix = nRT (xA ln xA + xB ln xB) • n = nA + nB • Fungsi kelebihan • SE = ∆S mix + nR (xA ln xA + xB ln xB)

  2. SIFAT KOLIGATIF Sifat koligatif berasal dari pengurangan potensial kimia pelarut cair akibat adanya zat terlarut • Kenaikan titik didih • Penurunan titik beku • Kelarutan • Osmosis

  3. A(g) A(l)+B Kenaikan Titik Didih

  4. Pers 1 Pers 2 xB = 0, maka T=T* Selisih pers 1 dan 2

  5. Buktikan !

  6. Penurunan Titik Beku A(l)+B A(s) Turunkan pers ∆T=Kf mB

  7. KELARUTAN A(l)+solut B A(s) Buktikan !

  8. OSMOSIS Gejala osmosis: Perjalanan pelarut murni ke larutan yang keduanya terpisah oleh membran semipermiabel Tekanan osmosis: Tekanan yang harus diberikan kepada larutan agar aliran berhenti P+ P Osmometri:Penentuan massa molar dengan pengukuran tekanan osmosis, mis: makromolekul

  9. Persamaan Van Hoff Untuk larutan encer: ln xA = ln(1-xB)  -xB xB  nB/nA & nAVm=V (Vpelarut) Persamaan Van Hoff

  10. Persamaan virial  = [B] RT Hanya berlaku pada larutan encer yang berperilaku ideal Untuk larutan non ideal  = [B] RT{1+B [B] +……...} Kontribusi ketidak idealan

  11. Contoh soal Tekanan osmosis poli vinil klorida (PVC) dalam sikloheksana pada temperatur 298 K dinyatakan dalam tinggi larutan ( = 0,980 g cm-3. C/(g.dm-3) 1,00 2,00 4,00 7,00 9,00 h/cm 0,28 0,71 2,01 5,10 8,00 Hitung massa molar polimer dengan pers virial  = [B] RT{1+B [B] +……...} [B]=C/M,  =  g h

  12. h/c = (RT/ gM) +(RTB/ gM2) C Intersep = RT/ gM slop = RTB/ gM2 Buat grafik h/c versus c Jawab: M = 1,2 . 105 g/mol  = [B] RT{1+B [B] +……...} [B]=C/M,  =  g h

  13. grafik h/c versus c 0,21

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