hitunglah molaritas larutan berikut; a. 4,00 g NaOH dalam 0,500 liter b. 3,20 g KMnO4 dalam 0,800 liter

SIFAT KOLIGATIF LARUTAN
[Molaritas (M)]

a)
wt = 4,00 gram
V = 0,500 liter = 500 mL
Mr = 40
M = ........................?

M = wt/Mr x 1000/V
= 4,00/40 x 1000/500
= 0,1 x 2
= 0,2 molar


b)
wt = 3,20 gram
V = 0,800 liter = 800 mL
Mr = 158
M = ........................?

M = wt/Mr x 1000/V
= 3,20/158 x 1000/800
= 0,02 x 1,25
= 0,025 molar