Physics, 27.09.2020 14:01 dummynate

Please help I don't understand. A teacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and pH indicator strips, which measure acidity. The teacher asks the students to put the liquids in order from most acidic to most basic. What type of investigation could the students conduct to determine the correct order for the liquids? 1. descriptive 2.Comparitive 3. experimental
The type of liquid is 1. independent variable 2. dependant variable 3. control group
The pH is 1. independent variable 2. dependant variable 3. control group

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Please help I don't understand. A teacher gives students four liquids commonly found in the kitchen...