1.Oblicz stezenie procentowe 0,5-molowego roztworu Na2S , gesteosc 1040g/dm3
2.Oblicz stezenie molowe roztworu otrzymanego po rozpuszczeniu 50g chlorku wapnia w 150cm3 wody.Jezeli gestosc tego roztworu wynosi 1,23g/cm3
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1.
MNa2S = 78g/m
Cp = Cm*M*100/d = 0,5 * 78 * 100/1040 = 3,75%
2.
mr = 50 + 150 = 200g
V = 200 * 1,23 = 246 cm3 = 0,246dm3
MCaCl2 = 111g/m
n = 50/111 = 0,45 mola
Cm = 0,45/0,246 = 1,83mol/dm3