Astudent finds an unlabeled bottle of liquid under
his kitchen sink. which investigation would best
him identify the unknown liquid as acidic,
basic, or neutral?
healing the unknown liquid to its boiling point
b. cooling the unknown liquid to its freezing point
c adding some of the unknown liquid to red litmus
paper
d. adding an equal amount of water to the
unknown liquid

C. Adding some of the unknown liquid to red litmus paper.

Explanation:

Since the student doesn't know what the liquid is, it is not safe to experiment with it by boiling, cooling, or adding water to it. The safest option would be to add a small bit of the liquid to the litmus paper, which will identify the liquid as neutral, basic, or acidic.

The answer is C. Adding some of the unknown liquid to red litmus paper.