Page 56 - FORTO POLIO SIFAT KOLIGATIF LARUTAN 1 - Copy - Copy_Neat

Contoh Soal :

1. Hitunglah tekanan uap larutan NaOH 10%. Jika tekanan uap pelarut murni

(air) pada suhu tertentu adalah 105 mmHg!

Diketahui :

% NaOH = 10%  misalkan massa total larutan = 100 gram
massa NaOH = 10% x 100 gram = 10 gram

% H 2O = (100 – 10) % = 90%  massa H 2O = 90% x 100 gram 90 gram
Mr NaOH = 40
Mr H 2O = 18
o
P = 105 mmHg

Ditanya : P larutan = ….?

Jawab :
o
P = P . X B . i

o
P = P . ( ) . i

= 105 x ( )

= 30 x ( )

= 30 x ( )

= 30 x ( )

= 30 x ( )

= 30 x ( )

=

56