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 The measurement of the soil's alkalinity versus acidity, on a scale of 1-14 with 7 being neutral, 1-6 on the acid side and 8-14 on the alkaline side.
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?