Hydronium Ion Concentration

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The pOH of a solution is 5.06. What is its hydronium-ion concentration?

A. 1.1×105 M
B. 1.1×10-9 M
C. 8.7×10-6 M
D. 5.06 M
E. 6.3×10-3 M

READ ALSO :   Suppose a game has four players with votes 4, 2, 1, 1, respectively, for each player i = 1, 2, 3, 4. The quota is q = 5. Show that the Banzhaf–Coleman index for player 1 is more than twice the index for player 2 even though player 2 has exactly half the votes player 1 does