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1,71=mol x 171
mol=0,01 mol
Molar = mol / vol
Molar= 0,01/0,25
Molar = 0,04M
Ba(OH)2 => Ba2+ + 2 OH-
Karena perbandingan koefisien maka 2 molar Ba(OH)2 = molar OH- = 0,08M
karena basa, yang bisa dihitung dulu adalah pOH
pOH=-log[OH-]
pOH= -log 0,08
pOH= 2-log8
pH= 14-(2-log8)= 12+log8