What is amperometry?

• A. A method to measure temperature changes
• B. A technique for detecting ions based on electric current changes
• C. A way to measure viscosity
• D. A method for assessing fluid density

Answer: (B)

Amperometry is a technique used to measure the electric current produced in an electrochemical reaction. In this method, the current is directly related to the concentration of an analyte, such as ions, in a solution. When a voltage is applied to an electrode immersed in the solution, ions present in the solution can either gain or lose electrons, resulting in a measurable electric current. This current measurement can be used to quantify the concentration of the ions being detected, making amperometry particularly useful in various applications, including environmental monitoring, clinical analysis, and food safety testing.

The other options do not accurately describe amperometry. Measuring temperature changes refers to a different method that assesses heat variation, while viscosity measurement evaluates the thickness or resistance of a fluid to flow. Assessing fluid density involves determining mass per unit volume, which is not related to electric current changes. Thus, B accurately encapsulates the essence and application of amperometry.