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Ksp = 1/n ( OH^-) pangkat n + 1
Mg(OH)2 ----- n = 2 ; 4 x 10^-12 = 1/2 (OH^-) pangkat 2 +1
4 x 10^-12 = 1/2 (OH^-) pangkat 3
(OH^-)pangkat 3 = 8 x 10 ^-12
(OH^-) = 2 x 10 ^-4
maka : pOH = - log (OH^-)
= - log 2 x 10 ^-4
= 4 - log 2
pH = 14 - ( 4 - log 2 )
= 10 + log 2