20 Questions
What is the unit of conductance?
Mho
How does conductance change with an increase in temperature?
It increases
What factor determines the conductance of an electrolytic solution?
Nature of ions
Why is conductometric determination recommended to be carried out on diluted solutions?
To minimize interionic attraction forces
What happens to the conductance at infinite dilution?
It represents each ion independently
What do electrochemical methods of analysis deal with?
Electrical quantity or property of a solution
Why are electrochemical methods used when classical methods of analysis cannot be applied?
When there is no suitable indicator
Which electrochemical method depends on the movement of ions in an electric field without occurrence of redox reaction at the electrode surface?
Conductometry
Which electrochemical method depends on measuring voltage or current between two electrodes where redox reactions take place at the electrodes surfaces?
Potentiometry
What is the primary advantage of electrochemical methods of analysis?
Shorten the time required for analysis
Which type of method deals with the movement of ions in an electric field leading to conductance of electricity without occurrence of redox reaction at the electrode surface?
Conductometry
What is the primary advantage of electrochemical methods of analysis?
Faster analysis time
In which case are electrochemical methods used when classical methods of analysis cannot be applied?
When there is no suitable indicator
Which electrochemical method measures the voltage or current between two electrodes where redox reactions take place at the electrodes surfaces?
Potentiometry
Why is conductometric determination recommended to be carried out on diluted solutions?
It increases the precision of the results
Which factor does NOT determine the conductance of an electrolytic solution?
Size of the electrodes
What is the relationship between conductance and concentration in a highly concentrated solution?
Conductance decreases with an increase in concentration
What is the relationship between conductance and temperature in an electrolytic solution?
Conductance increases with an increase in temperature
At infinite dilution, what is the relationship between activity (a) and concentration (c) of ions?
a/c = 1, outside the infinite dilution a/c < 1
What determines the velocity by which ions move towards the electrodes carrying the electric current?
Number of charge the ion carries
Study Notes
Conductance and Electrochemical Methods
- The unit of conductance is Siemens (S).
- Conductance decreases with an increase in temperature.
- The conductance of an electrolytic solution is determined by the concentration, viscosity, and temperature of the solution.
Conductometric Determination
- Conductometric determination is recommended to be carried out on diluted solutions.
- At infinite dilution, the conductance is maximum and the relationship between activity (a) and concentration (c) of ions is a = c.
Electrochemical Methods
- Electrochemical methods of analysis deal with the movement of ions in an electric field and the occurrence of redox reactions at the electrode surface.
- Electrochemical methods are used when classical methods of analysis cannot be applied, such as in cases where the analyte is present in low concentrations or is difficult to detect.
- The primary advantage of electrochemical methods of analysis is their high sensitivity and selectivity.
Types of Electrochemical Methods
- Conductometry depends on the movement of ions in an electric field without the occurrence of redox reactions at the electrode surface.
- Voltammetry depends on measuring the voltage or current between two electrodes where redox reactions take place at the electrodes surfaces.
Factors Affecting Conductance
- The velocity by which ions move towards the electrodes carrying the electric current is determined by the mobility of ions.
- In highly concentrated solutions, the relationship between conductance and concentration is non-linear.
- The relationship between conductance and temperature in an electrolytic solution is that conductance decreases with an increase in temperature.
Test your knowledge of electrochemical methods of analysis in analytical chemistry with this quiz. Learn and understand the principles, instruments, and applications of electrochemical methods.
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