Question

The cell constant of a conductivity cell:

• A. changes with change of electrolyte
• B. changed with change of concentration of electrolyte
• C. changes with temperature of electrolyte
• D. remains constant for a cell

Answer 1

The correct option is D remains constant for a cell

The cell constant, K, is equal to the distance in cm between the probe's electrodes divided by the surface area of the electrodes in $c{m}^2$. For solutions with low conductivities the electrodes can be placed closer together or made larger so that the cell constant is less than one.

For a particular conductivity cell the cell constant remains same even if-

• Electrolyte is changed.
  
• Concentration of electrolyte is changed.
  
• Temperature of electrolyte is changed.