11 Questions
What is the meaning of the term 'specific conductance' or 'conductivity' denoted by the symbol K?
The conductance when the length (L) is unity (1 cm) and the area (A) is unity (1 cm²)
What is the relationship between the observed conductance (G), specific conductance (K), and the cell constant (L/A)?
G = K × A / L
Why is it important to use platinum (Pt) electrodes in conductometric measurements?
Pt electrodes are more stable and do not undergo redox reactions
Why are conductometric determinations carried out using alternating current (AC) instead of direct current (DC)?
AC reduces the polarization of the electrodes
Why are conductometric determinations typically carried out using diluted solutions?
Diluted solutions minimize the effect of ion interactions and complexation
What is the purpose of maintaining a constant cell constant (L/A) during conductometric determinations?
To ensure a consistent relationship between conductance and specific conductance
Why are conductometric determinations typically carried out under thermostatically controlled conditions?
To ensure accurate and reproducible measurements
What is the main advantage of using electrochemical methods of analysis, such as conductometry, over other analytical techniques?
Simpler sample preparation
Which of the following is not a key factor that affects the specific conductance (K) of a solution?
pH of the solution
What is the main reason for using solutions of known conductivity to determine the cell constant (L/A) of a conductometric measurement system?
To establish the relationship between conductance and specific conductance
How does the choice of cell constant (L/A) affect the conductometric measurements of solutions with different conductivity levels?
Cells with higher L/A are used for solutions with higher conductivity
This quiz covers definitions related to conductometry, including conductance and conductometry itself. It also touches on Ohm's law and the concept of resistance. The quiz emphasizes that not all substances exhibit the same conductance.
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