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Calculate either [H3O+] or [OH-] for the solutions below at 25 degree C

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Calculate either [H3O+] or [OH-] for the solutions below at 25 degree C. a) [OH-]= 1.31x 10^-7 M Number [H3O+]=6.89 M b) [H3O+]= 9.35 x 10^-9 M Which of these solutions are basic at 25degree C? Number (a) (b)(c) [OH-]= 8.03 M c) [H3O+]=0.000715 M Number [OH -]= 3.14 M