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Hydrogen ion concentration

At 25C 0.212g of barium hydroxide is dissolved in water to make 0.25ltr final solution. molecular mass 154.33 contains 137g Ba 16g O 1g H - need the hydrogen ion concentration in mol litre-1 in scientific notation. and the PH of this solution to the nearet integer -does the answer agree with the sort of PH value expected for a basic solution.
I have my answer but I would like to know if I am right. Many thanks Sandie