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Vkwasu = 200cm³
cmzasady = 0,5mol/dm³
C₆H₅COOH + KOH = C₆H₅COOK + H₂O
Zobojętnienie gdy :
n H+ = n OH-
Vz*cmz = Vkw*cmkw
Vzas = Vkw*cmkw/cmzas
V= 200cm³*0,4mol/dm³/0,5mol/dm³ = 160cm³