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tulis dulu persamaan reaksi
KSP = X(OH)2 -> X + 2OH
[S] [2S]^2
5 x 10^-4 = 4S^3
1,25 x 10^-4 = S^3
125 x 10^-6 = S^3
5 x 10^-2 = S
nah S udah diketahui dimasukan lagi ke reaksi bro
X(OH)2 > X + 2OH
0,05 0,1
OH- = 0,1
pOH = 1
pH = 13
kalo ada yang salah , kritik ya bro