1.1 Gehalte und Konzentrationen
1.1.1 Massenkonzentration
Aufgabe 1
50 mg Zucker werden in 250 ml Wasser aufgelöst. Berechnen Sie die Massenkonzentration.
m 50 mg 0, 05 g g
β= = = = 0, 2 = 0, 02 % (1)
V 250 ml 0, 25 l l
1.1.2 Stoffmengenkonzentration
Aufgabe 2
5 g KOH werden in 300 ml Wasser aufgelöst. Berechnen Sie die Stoffmengenkonzentration.
m 5 g
n g
56 mol 0, 09 mol mol
c= = M
= = = 0, 3 (2)
V V 300 ml 0, 3 l l
Aufgabe 3
5 mol HCl werden in 300 ml Wasser aufgelöst. Berechnen Sie die Stoffmengenkonzentration
und die Masse der Salzsäure.
n 5 mol 5 mol mol
c= = = ≈ 16, 7 (3)
V 300 ml 0, 3 l l
g
m = n · M = 5 mol · 36 = 180 g (4)
mol
1.1.3 Verhältnisangaben
Aufgabe 4
Formen Sie in die vorgegebene Einheit um.
23 % = 230 h 15 % = 150 g
l
15 % = 150.000 ppm 35 h= 35.000.000 ppb
1
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