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*W AgNO3 = 1,7 gram
*W H2O = 170 gram
*α = 80% = 0,8
*ΔTf = ... ?
AgNO3 adalah larutan elektrolit, maka nilai ΔTf bergantung juga terhadap faktor Van Hoff sehingga:
AgNO3 ⇔ Ag+ + NO3- ; n = 1+1 = 2
A. Mencari faktor van hoff
i = 1 + (n-1)α
= 1 + (2-1)0,8
= 1,8
B. Mencari molal AgNO3
m = n x 1000 / p (gram)
= g x 1000 / Mr x p (gram)
= 1,7 x 1000 / 170 x 170
= 0,0059 molal
Mencari ΔTf
--> Nilai Kf air (H2O) adalah 1,86 C/m, maka:
ΔTf = Kf x m x i
= 1,86 C/m x 0,0059 m x 1,8
= 0,0197 C