What pH level indicates that a solution is alkaline?

A solution is classified as alkaline, or basic, when its pH level is greater than 7.0. The pH scale ranges from 0 to 14, with 7.0 being neutral. Values below 7.0 indicate acidic solutions, while values above 7.0 denote alkaline solutions. Thus, any pH level higher than 7.0 signifies that the solution has a higher concentration of hydroxide ions compared to hydrogen ions, which is the defining characteristic of alkaline substances. This is why the option indicating a higher pH level than 7.0 is the correct answer.