In water, barium hydroxide is hydrolysed as follows. Ba(OH)2⇌‌Ba2++2OH− ‌conc. of ‌Ba2+‌=1×10−3M ‌ conc. of ‌[OH−]‌=2×1×10−3M ‌=2×10−3M pOH‌=−log[OH−] ‌=−log(2×10−3) ‌=2.69 pH+pOH‌=14 pH‌=14−pOH ‌=14−2.69 ‌=11.3 ‌‌≈11.0