sentence2_structure: The ph scale measures acids<>and<>bases$$$The ph scale measures acids<>and bases and has<>7$$$The ph scale measures acids<>and bases and has 7 as<>a neutral value$$$bases<>and has<>7$$$bases<>and has 7 as<>a neutral value$$$7<>as<>a neutral value
sentence1: pH A measure of the hydrogen-ion activity in a solution, expressed as the negative log10 of hydrogen ion concentration on a scale of 0 (highly acidic) to 14 (highly basic) with a pH of 7  being neutral.
sentence2: The ph scale measures acids and bases and has 7 as a neutral value.
question: Which scale measures acids and bases and has 7 as a neutral value?