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= 0,32/40.1000/200
= 0,008.5
= 0,04
= 4x10^-2
[OH] = x.M
= 1.4x10^-2
[OH] = 4x10^-2
pOH = -log[OH]
= -log 4x10^-2
= 2-log4
pH = 14-pOH
= 14 - (2-log4)
= 12+log4