Úloha ID 2828 - 
Jaká bude koncentrace roztoku chloridu sodného vzniklého smícháním 300 ml roztoku o koncentraci 4 mol/l, 500 ml roztoku o koncentraci 0,1 mol/l a 200 ml roztoku o koncentraci 0,5 mol/l?
Správná odpověď je: B
Látkové množství výsledného roztoku bude rovno součtu látkových množství jednotlivých roztoků. Výpočet bude vypadat následovně:
c = [(4 · 0,3) + (0,1 · 0,5) + (0,5 · 0,2)]/(0,3 + 0,5 + 0,2) = 1,35 mol/l.
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