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OH^- = /kb.cb
= /10^-5 . 10^-1
= /10^-6
= 10^-3
POH = - log (OH^-)
= - log 10^-3
= 3
PH = 14 - 3 = 11
OH⁻=10⁻¹
OH⁻=√kb . Mb
=√10⁻⁵ . 10⁻¹
=√10⁻⁶
=10⁻³
pOH=-log 10⁻³
=3
pH=pKw-pOH
=14-3
=11