Med Tech Exam Review - Clinical Chemistry | Actual Exam Questions | 100% Correct Answers | Verified 2024 Version

In the analytic technique of potentiometry, a comparison is made between the voltage of one half-cell connected to another half-cell. It is customary that all half-cell potentials be compared to the potential generated by a standard electrode. This standard electrode is: a. A hydrogen electrode b. a calcium electrode c. a potassium electrode d. a copper electrode e. an iron electrode - A. a half-cell, also called an electrode, is composed of a single metallic conductor surrounded by a solution of electrolyte. An electrochemical cell consists of two half-cells. If two different kinds of half-cells are connected in such a way as to make a complete circuit, a current will flow because of the potential difference between the two electrodes. The connection must be between the two electrolyte solutions, usually by means of a salt bridge. The universally accepted standard halfcell with which all other half-cells are compared is the hydrogen electrode, arbitrarily assigned a potential E of 0.000 volt in an electrolytic cell, the half-cell where reduction takes place is known as the a. anode b. cathode c. inidcating electrode d. reference electrode e. standard electrode - B. oxidation involves the loss of electrons, and reduction the gain of electrons. In an electolytic cell composed of two different half-cells - for example, zinc in zinc sulfate and copper in copper sulfate - electrons will flow from the anode to the cathode. thus reduction takes place at the cathode mercury covered by a layer of mercurous chloride in contact with satruated potassium chloride solution is a description of which of the following types of electrodes? a. antimony