Modelová Otázka ID 2833 - 
Jaká je koncentrace roztoku hydroxidu draselného, pokud 30 ml tohoto roztoku reaguje beze zbytku s 20 ml roztoku kyseliny chlorovodíkové o koncentraci 0,6 mol/l?
Správná odpověď je: A
Rovnice reakce bude vypadat takto:
KOH + HCl → KCl + H2O.
Výpočet koncentrace provedeme následovně:
n(KOH) = n(HCl)
c(KOH) · V(KOH) = c(HCl) · V(HCl)
c(KOH) = [c(HCl) · V(HCl)]/V(KOH) = (0,6 · 0,02)/0,03 = 0,4 mol/l.
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