calculate the force of gravity between two masses of 25kg the masses are 8m apart the gravitational constant is 6.67 x 10^-11 N m^2/kg^2

Ateacher 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?