Nursing Entrance Exam Practice Test 2026 – Complete Prep Resource

The tool that is specifically designed to measure the acidity or alkalinity of a solution is a pH meter. This instrument measures the hydrogen ion concentration in a solution, which in turn indicates the pH level, typically ranging from 0 (very acidic) to 14 (very basic or alkaline), with 7 being neutral. A pH meter provides precise readings and is widely used in laboratory settings, environmental monitoring, and various industries to ensure that chemical properties meet necessary standards.

Other tools have different functions. A thermometer measures temperature, a barometer measures atmospheric pressure, and a hydrometer measures the specific gravity (or density) of liquids. Each of these tools serves a specific purpose that does not relate to assessing the acidity or alkalinity of solutions. Hence, the pH meter is the appropriate choice for this measurement.