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Conductometry and Ohm's Law Definitions

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Questions and Answers

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) (correct)

The conductance of a solution at a specific concentration and temperature

The conductance of a cubic centimeter of liquid (1 cm³)

The ratio of conductance to cell constant (L/A)

What is the relationship between the observed conductance (G), specific conductance (K), and the cell constant (L/A)?

G = (L/A) × K

G = K × A / L (correct)

G = K / (L/A)

G = (L/A) / K

Why is it important to use platinum (Pt) electrodes in conductometric measurements?

Pt electrodes are more stable and do not undergo redox reactions (correct)

Pt electrodes have a higher conductivity than other metals

Pt electrodes are more sensitive to changes in conductance

Pt electrodes are more widely available and cost-effective

Why are conductometric determinations carried out using alternating current (AC) instead of direct current (DC)?

AC reduces the polarization of the electrodes Signup and view all the answers

Why are conductometric determinations typically carried out using diluted solutions?

Diluted solutions minimize the effect of ion interactions and complexation Signup and view all the answers

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 Signup and view all the answers

Why are conductometric determinations typically carried out under thermostatically controlled conditions?

To ensure accurate and reproducible measurements Signup and view all the answers

What is the main advantage of using electrochemical methods of analysis, such as conductometry, over other analytical techniques?

Simpler sample preparation Signup and view all the answers

Which of the following is not a key factor that affects the specific conductance (K) of a solution?

pH of the solution Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers