Question

Larutan 100 gram asam oksalat H2C2O4 dalam 500 gram air (Kf=1,86) membeku pada -7,44 C. tentukan derajat ionisasi asam oksalat tersebut. (Ar C=12 O=16 H=1)

Answer 1

△Tf = kf.m.i
△Tf = kf x gr/mr x 1000/p x (1+(n-1)∞)
7,44 = 1,86 x 100/90 x 1000/500 x (1+(3-1)∞)
7,44 = 1,86 x 10/9 x 2 x (1+2∞)
7,44 = 37,2/9 x (1+2∞)
7,44 = 4,13 x (1+2∞)
1+2∞ = 7,44 / 4,13
1+2∞ = 1,8
2∞ = 1,8 - 1
2∞ = 0,8
∞ = 0,4