Modelová Otázka ID 2834 - 
Při neutralizaci 20 ml roztoku hydroxidu draselného o koncentraci 0,45 mol/l bylo spotřebováno 15 ml roztoku kyseliny sírové. Jaká byla koncentrace tohoto roztoku?
Správná odpověď je: D
Rovnice reakce bude vypadat takto:
2 KOH + H2SO4 → K2SO4 + 2 H2O.
Výpočet koncentrace provedeme následovně:
n(KOH) = n(H2SO4) · 2
c(KOH) · V(KOH) = c(H2SO4) · V(H2SO4) · 2
c(H2SO4) = [c(KOH) · V(KOH)]/[2 · V(H2SO4)] = (0,45 · 0,02)/(2 · 0,015) = 0,3 mol/l.
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