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What does a solution with a hydronium ion concentration of## 10^-11## M have a pH of?
##pH=11##
##pH=-log_10[H_3O^+]##
##[H_3O^+]=10^-11*mol*L^-1##
##-log_10[H_3O^+]=-log_10(10^-11)=-(-11)=11##.
Clearly, this is an aqueous solution. Is this an acidic or basic solution?