Tentukan pH200ml Ca [OH]2 0,004

[OH-] = M x valensi basa
          = 0,004 x 2
          = 0,008 = 8x10^-3
pOH = - log [OH-]
         = - log (8x10^-3)
         = - (log 8 + log 10^-3)
         = 3-log8
pH = 14 - pOH
      = 14 - (3 - log 8)
      = 11 + log 8