Modelová Otázka ID 2872 - 
Určete pH roztoku HCl, který byl připraven zředěním 100 ml zásobního roztoku (c = 0,1 mol/l) 400 ml vody.
Správná odpověď je: D
Hodnotu pH vypočítáme následujícím způsobem:
V(řeď.) = 100 + 400 = 500 ml
c(řeď.) = [c(zás.) · V(zás.)]/V(řeď.) = (0,1 · 0,1)/0,5 = 0,02 mol/l
pH = −log (c) = −log (0,02) = 1,7.
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