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PERHITUNGAN 1. ∆Tf asam cuka: ∆Tf 1 = T°f –Tf 1 = 9°C - 6°C = 3°C 2. Menghitung Kf : Kf = w x M i x ∆Tf 1000 x w i W = massa asam cuka = ρ x v = 1,049 g cm -3 x 20ml = 1040 g dm -3 x 0,02 L = 20,8 g W i = massa naftalen = ρ x v = 4,4 g L -1 x 20 mL = 4,4 g L -1 x 0,02L = 0,088 g Kf = w x M i x ∆Tf = 20,8 g x 128 g mol -1 x 3°C = 3,99 g.mol -1 °C 1000 x w i 1000 x 2 g 3. Menghitung ∆Tf zat X ∆Tf 2 = T°f –Tf 2 = 9°C - 6°C = 3°C 4. Menghitung ∆Tf :
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PERHITUNGAN
1. ∆Tf asam cuka:
∆Tf1 = T°f –Tf1
= 9°C - 6°C = 3°C
2. Menghitung Kf :
Kf = w x Mi x ∆Tf
1000 x wi
W = massa asam cuka = ρ x v
= 1,049 g cm-3 x 20ml
= 1040 g dm-3 x 0,02 L
= 20,8 g
Wi = massa naftalen = ρ x v
= 4,4 g L-1 x 20 mL
= 4,4 g L-1 x 0,02L
= 0,088 g
Kf = w x Mi x ∆Tf = 20,8 g x 128 g mol -1 x 3°C = 3,99 g.mol-1°C
1000 x wi 1000 x 2 g
3. Menghitung ∆Tf zat X
∆Tf2 = T°f –Tf2
= 9°C - 6°C = 3°C
4. Menghitung ∆Tf :
1000Kfmassaasamcuka [ mzat xMr zat x
+ mnaftalenaBM naftalen ]= ∆Tf1 + ∆Tf2
1000 x 3,99g° C/mol20,8 g [ 2 g
Mr zat x+ 0,088g
128g /mol ] = 3°C + 3°C
191,82 °C /mol x [ 2gMr zat x
+ 2 g128 g/mol ] =6°C
[ 2gMr zat x
+ 2 g128 g/mol ] = 0,0312 mol
2 gMr zat x = 0,0312 mol – 0,0156 mol
2 gMr zat x = 0,0156 mol
Mr zat x = 2g = 128,2 g.mol-1
0,0156 mol
5. Grafik asam cuka glasial, waktu vs suhu
0 1 2 3 4 5 6 7 8 9 100
5
10
15
20
25
f(x) = − 1.5030303030303 x + 21.3636363636364
Series2Linear (Series2)
6. Grafik asam cuka glasial + naftalen, waktu vs suhu
0 1 2 3 4 5 6 7 8 9 100
5
10
15
20
25
f(x) = − 1.50909090909091 x + 16.6909090909091R² = 0.748831479401428 Series2
Linear (Series2)
Waktu (s)
Suhu (T)
Suhu (T)
Waktu (s)
7. Grafik asam cuka glasial + naftalen + zat X, waktu vs suhu
0 1 2 3 4 5 6 7 8 9 100
5
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20
25
f(x) = − 1.33939393939394 x + 15.5272727272727R² = 0.760941029835631 Series2
Linear (Series2)
Suhu (T)
Waktu (s)
