Electrochemistry and Galvanic Cells

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Questions and Answers

What is the primary reason for using an alternating current (AC) source of power?

  • To resolve the first difficulty of connecting a solution to a bridge (correct)
  • To increase the voltage across the conductivity cell
  • To improve the conductivity of the platinum electrodes
  • To reduce the resistance of the connecting wires

What is the purpose of the conductivity cell?

  • To separate the platinum electrodes from the solution
  • To reduce the resistance of the solution
  • To confine the solution between the electrodes (correct)
  • To measure the voltage across the electrodes

What is the material used to coat the platinum electrodes?

  • Copper
  • Silver
  • Gold
  • Platinum black (correct)

What is the symbol used to denote the cell constant?

<p>G* (C)</p> Signup and view all the answers

What is the unit of the cell constant?

<p>Length^-1 (C)</p> Signup and view all the answers

Why is it inconvenient to measure l and A?

<p>Because it is difficult to accurately measure l and A (C)</p> Signup and view all the answers

How is the cell constant usually determined?

<p>By measuring the resistance of the cell containing a solution whose conductivity is already known (A)</p> Signup and view all the answers

What is the purpose of electrochemically depositing finely divided metallic Pt on the electrodes?

<p>To increase the surface area of the electrodes (B)</p> Signup and view all the answers

What is the equation that gives the resistance of the solution column?

<p>R = r l/A (B)</p> Signup and view all the answers

What is the shape of the solution column?

<p>Cylindrical (C)</p> Signup and view all the answers

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