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i need help for the three questions What concentration of barium hydroxide is needed to give an aqueous solution with a pH of 9.790? Molarity

i need help for the three questions
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What concentration of barium hydroxide is needed to give an aqueous solution with a pH of 9.790? Molarity of barium hydroxide = M pH= What concentration of barium hydroxide is needed to give an aqueous solution with a pOH of 2.660 ? Molarity of barium hydroxide = M

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