Lab 17 pH of Chemicals.docx - Lab 17 Measuring the pH of...

This preview shows page 1 - 2 out of 2 pages.

Lab 17: Measuring the pH of Acids and Bases PURPOSE: To determine experimentally the pH of several acid, base, and salt solutions. CAUTION: Students must wear departmentally approved eye protection while performing this experiment. Wash your hands before touching your eyes and after completing the experiment. If acid or base contacts your skin, wash the affected area with copious quantities of water. Be especially cautious with all the solutions, they are extremely caustic and corrosive. PRINCIPLES: A pH meter and its electrodes form a sensitive electrochemical device that will allow an accurate, reproducible, and reliable measurement of the pH of a solution. A pH meter is essentially a voltmeter that measures the voltage of an electric current flowing through a solution between two electrodes. There is a direct relationship between the voltage and the pH of a solution. As a result, the meter on the instrument is calibrated directly in pH units. Although the operating rules for a pH meter will depend on the model and the manufacturer, there are several steps that must be followed with any pH meter: 1.

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture