MDCAT Chemistry MCQ #5422

In the industrial production of sodium metal by the Down's process, calcium chloride is added to the electrolyte. What is the primary purpose of this addition?

MDCAT Chemistry MCQ #5422

  1. Question 1

    Q1. In the industrial production of sodium metal by the Down's process, calcium chloride is added to the electrolyte. What is the primary purpose of this addition?

    • A) To increase the purity of sodium
    • B) To prevent the back-reaction of Cl2
    • C) To lower the melting point of NaCl
    • D) To increase the conductivity of the melt

    Answer: To lower the melting point of NaCl

    Explanation: In Down's cell, CaCl2 is added to lower the melting point of NaCl from 801 to 600 degrees Celsius, saving energy and preventing Na vaporization.