The pH of a solution of Ba(OH)2 is 12.99 at 25
pH of barium hydroxide is given 12.99, however the [OH-] is also given as 9.8x 10-2.
Since one molecule of barium hydroxide gives 2 moles of OH- ions [Ba(OH)2] = 4.9 x 10-2M
We have the relation of molarity to weight of substance as
M = (w .1000)/( Molar massxvolume of solution)
Substituting the values, M = 4.9 x 10-2 , molar mass = 171g/mol, volume =120mL we get
Weight of Ba(OH)2 = 1.0055g
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