What is required to measure the conductivity of a solution?

To measure the conductivity of a solution, a conductivity meter is essential. This instrument is specifically designed to evaluate how well an electrical current can pass through a liquid. The conductivity of a solution is influenced by the presence of ions; the more ions present, the higher the conductivity. Conductivity meters function by applying a voltage and measuring the resultant current, which allows for the straightforward determination of the solution’s ionic concentration.

Other instruments listed have different specific uses: a pH meter measures the acidity or alkalinity of a solution, a spectrophotometer is used to measure how much light a chemical substance absorbs, and a thermometer is used solely for measuring temperature. Each of these instruments serves its own distinct purpose and does not provide the necessary measurements for assessing conductivity.