Úloha ID 2824 - 
Jaká je molární (látková) koncentrace roztoku připraveného rozpuštěním 18 g NaHCO3 ve 200 ml vody? Ar(Na) = 23
Správná odpověď je: C
Molární hmotnost NaHCO3 je 84 g/mol. Výpočet bude vypadat následovně:
c = n/V = (m/M)/V = m/(M · V) = 18/(84 · 0,2) = 1,1 mol/l.
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