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Presentation
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
Aloh Mudaiyin
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5 Slides • 0 Questions
1
SIFAT KOLIGATIF LARUTAN
ELEKTROLIT
2
Sifat koligatif larutan elektrolit :
Sifat koligatif yang dimiliki oleh zat yang dapat terionisasi dalam larutannya
Larutan elektrolit dapat berupa :
1. Asam
2. Basa
3. Garam
Karena dapat mengalami ionisasi maka jumlah partikel larutan elektrolit lebih
besar dibanding larutan non elektrolit, sehingga sifat koligatif larutan elektrolit
juga lebih besar daripada larutan non elektrolit
Faktor Van’t Hoff (i):
Perbandingan antara sifat koligatif larutan elektrolit dengan non elektrolit.
i =
𝑗𝑢𝑚𝑙𝑎ℎ 𝑝𝑎𝑟𝑡𝑖𝑘𝑒𝑙 𝑑𝑎𝑙𝑎𝑚 𝑙𝑎𝑟𝑢𝑡𝑎𝑛 𝑒𝑙𝑒𝑘𝑡𝑟𝑜𝑙𝑖𝑡
𝑗𝑢𝑚𝑙𝑎ℎ 𝑝𝑎𝑟𝑡𝑖𝑘𝑒𝑙 𝑑𝑎𝑙𝑎𝑚 𝑙𝑎𝑟𝑢𝑡𝑎𝑛 𝑛𝑜𝑛 𝑒𝑙𝑒𝑘𝑡𝑟𝑜𝑙𝑖𝑡
i =
1 + (n-1)𝛼
ket: n = jumlah koefisien kation dan anion
𝛼 = derajat ionisasi
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4
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LATIHAN SOAL
1. Tentukan urutan titik didih larutan berikut :
a. NaCl 0,2 m
b. urea 0,2 m
c. K2SO4 0,2 m
d. gula 0,2 m
kb air = 0,52°c/m
2. Tentukan harga I untuk larutan berikut:
a. NaCl
b. Al2(SO4)3
c. H2SO4
d. CH3COOH, 𝛼 = 5%
3. Sebanyak 5,85 gram garam dapur (Mr=58,5) dilarutkan dalam
4 kg air. tentukan :
a. titik didih larutan
b. titik beku larutan
kb air = 0,52°c/m
Kf air= 1.86 °c/m
SIFAT KOLIGATIF LARUTAN
ELEKTROLIT
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