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pOH = 14-pH = 3-log2
konsentrasi OH⁻ = 2 x 10⁻³
2x10⁻³=√KbxM
4x10⁻⁶=Kbx0,4
Kb=1x10⁻⁵
untuk garam asam:
konsentrasi H⁺=√Kw/Kb x M
kons. H⁺= √4x10⁻¹°
= 2x10⁻⁵
pH = 5-log2