Question

Which solution will contain the higher concentration of hydroxide ions?
0.5 mol/L sodium hydroxide
or 0.25 mol/L barium hydroxide

Answer 1

Neither. Both will be the same.
(OH^-) in 0.50 M NaOH = 0.50 M
(OH^-) in 0.25 M Ba(OH)2 = 0.25 M Ba(OH)2 x [2 mols OH/1 mol Ba(OH)2 = 0.25 x 2/1 = 0.50 M

Answer 2

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Answer 3

Well, thanks, but you're behind the times. I've been answering question on this site since 2001 or 2002. I think I started something like April 2001. It's a great life if you don't weaken.