Potentiometry

Question 1

Equipment required ‘to do’ potentiometry…

Answer 1

• high input impedance voltmeter
• reference electrode
• indicator electrode

Question 2

Ion selective electrode (ISE)

Answer 2

electrochemical half cell. The voltage (which arises across a membrane where only the intended ions can interact) will vary depending on the activity of a specific ion

Question 3

Glass membrane electrode

Answer 3

Used for the measurement of pH. Have special ‘doped’ glass membranes that are sensitive to specific analyses in solution

Question 4

Liquid membrane electrode

Answer 4

Potential develops between a liquid ion exchanger (that selectively binds to the analyze ion) and a solution containing the analyte

Question 5

Solid state (crystal) membrane

Answer 5

membrane made from a single ionic compound, or a homogeneous mixture of ionic compounds.