Posted by Jakob on Tuesday, May 18, 2010 at 1:08pm.
How many moles Ba(OH)2 do you have?
moles = M x L.
There will be twice the molar concn of OH^- because there are two OH ions/1 molecule Ba(OH)2.
There are 6.022 x 10^23 OH^- in a mole of them. How many in the number of moles you have? Go from there.
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