Tetukan pH dari larutan Ca(OH)2 0,0002 M

OH⁻ = M . b = 0.0002 . 2 = 0.0004 M
pOH = - log OH⁻ = - log 4 . 10⁻⁴ = 4 - log 4 = 4 - 0.6 = 3.4
pH = 14 - pOH = 14 - 3.4 = 10.6 ⇒ Jawab