Food scientists apply principles of titrations to food testing and develop foods that meet certain food-safety standards. for example, the acidity of milk increases with time, making it sour. which statements make sense? check all that apply. the ph of sour milk is less than 7. to determine the concentration of the lactic acid in sour milk, you could titrate with a base. the more sour the milk is, the more base that will be needed to neutralize it.