Advanced Topic 939 of 1102 Analytical, Lab & Spectroscopy
Conductometric Titration
Equivalence point located from changes in conductivity.
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In-depth explanation of Conductometric Titration
Conductometric titration follows the electrical conductance of a solution as titrant is added, locating the equivalence point from the change in slope of a conductance versus volume plot. Conductance depends on the concentrations and mobilities of all ions present, and at equivalence the highly mobile H+ or OH- ions are replaced by ions of much lower mobility, producing a sharp change in slope. The method works well for dilute solutions and for weak acids or bases that give poor colour endpoints. It is also useful for precipitation titrations where the ions removed carry most of the conductance. Careful temperature control is required because conductance varies with temperature.
Going deeper: Conductometric Titration
Key ideas: Plot conductance (corrected for dilution by multiplying by (V0 + V)/V0) against titrant volume, extend the two straight branches and read the intersection. Ionic molar conductivities at 25 C: H+ about 350, OH- about 199, Na+ 50, Cl- 76 S cm2 mol-1. Use a conductivity cell with a cell constant and a titrant much stronger than the analyte to keep dilution small.
Common mistakes and connections: Students expect a sharp jump like a pH curve, but the signal is a change in slope. Salt in the sample hides changes and temperature drift distorts the lines. Do not confuse strong acid curves (V shape) with weak acid-strong base curves (rising slope after a small initial dip). Related to ionic mobility, electrolytes, strong and weak acids and precipitation titrations.
Visualization of Conductometric Titration
Adding NaOH to 25 mL of 0.1 M HCl replaces fast H+ with slower Na+, so conductance falls to a minimum at equivalence and then rises with excess OH-. The interactive lesson shows this as a live animation or chart.
Worked example and use case
Titrating hydrochloric acid against sodium hydroxide gives a V-shaped conductance curve with the minimum at the equivalence point.
Frequently asked questions about Conductometric Titration
What is Conductometric Titration?
Equivalence point located from changes in conductivity.
Is Conductometric Titration a beginner, intermediate or advanced topic?
Conductometric Titration is a advanced topic in Analytical, Lab & Spectroscopy. It builds on beginner and intermediate topics, so review those first if needed.
What should I learn before Conductometric Titration?
Study these earlier topics in Analytical, Lab & Spectroscopy first: Redox Titrations, Complexometric Titration, Potentiometric Titration.
What comes after Conductometric Titration?
The next topics in Analytical, Lab & Spectroscopy are Error Analysis and Standard Deviation.
Can I practise Conductometric Titration with quizzes?
Yes. The interactive lesson includes a self-check question on Conductometric Titration, and the Analytical, Lab & Spectroscopy quiz draws on every topic in this area.
Where Conductometric Titration fits in Analytical, Lab & Spectroscopy
Conductometric Titration is topic 63 of 99 in Analytical, Lab & Spectroscopy.