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4=Mx250
M=4/250=0,016 M
[OH-]=x[Ba(OH)2]
[OH-]=2(0,016)
[OH-]=0,032 M= 3,2 x10^-2 M
pOH= -log [OH-]= -log(3,2x10^-2)=2-log 3,2
pH= 14-pOH= 14-(2-log3)=12+log3=12,477