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Which solution is basic? a) [H3O^+] = 1.0x10^-4 b) [OH^-] = 1.0x10^-10 c) [H3O^+] = 1.0x10^-7 d) [H3O^+] = 1.0x10^-10 e) [OH^-] = 1.0x10^-7