Question

Tolong ya Kimia

PAKAI CARA​

Answer 1

Penurunan Titik Beku (∆Tf)

dik :

m = 1,00 molal

Tfl = -1,91 °C

dit :

% a = ...?

∆Tf = Tfp - Tfl

∆Tf = 0 °C - (-1,91)

∆Tf = 1,91 °C

∆Tf = m × Kf × i

1,91 °C = 1 × 1,86 × i

i = 1,03

HF => H+ + F-

i = 1 + (n - 1) a

1,03 = 1 + (2 - 1) a

a = 0,03

% a = 0,03 × 100 % = 3 %