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The pH of a solution measures its:



acidity or alkalinity

pH measures the acidity or alkalinity of a solution on a scale of 0-14. Viscosity, density, and boiling point are properties that can be used to describe a substance, but they are not directly related to the pH value of a solution. Viscosity refers to the thickness or resistance to flow of a substance, density describes the mass per unit volume of a substance, and boiling point is the temperature at which a substance changes from a liquid to a gas. While these properties may be affected by the pH of a solution, they are not direct measurements of it. Therefore, they are not correct options for this question.

Boiling point