Place in 100 ml graduated flasks exactly 5, 10, 15, 20 and 25 ml of this solution, corresponding respectively to amounts of sodium of 0.2, 0.4, 0.6, 0.8 and 1.0 mg.
V 100-mililitrske merilne bučke odpipetiramo 5, 10, 15, 20 in 25 ml te raztopine, kar ustreza 0,2, 0,4, 0,6, 0,8 in 1,0 mg natrija.