Thermometric Titration for H2 Chemistry Paper 4: Temperature Graphs, Endpoint, and Enthalpy
01 May 2026, 00:00 Z
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Q: What is thermometric titration?
A: It is a titration where the endpoint is found from a temperature change rather than a colour change.
TL;DR
In thermometric titration, you add reagent in measured portions, record temperature after each addition, plot temperature against volume, and estimate the equivalence volume from the intersection of two graph trends. The practical marks come from temperature control, small volume increments near the endpoint, cooling correction, and ACE discussion of heat loss, probe lag, and mixing.
Use this after the broader H2 Chemistry calorimetry guide and alongside the H2 Chemistry volumetric practical guide.
Status: SEAB H2 Chemistry 9476 syllabus checked 2026-05-01. The syllabus lists thermochemistry, including thermometric titration, in the Practical Assessment scope. This page focuses on the graph and endpoint technique.
1 | Why Use Thermometric Titration?
Indicator titrations use a colour change. Thermometric titrations use heat change. This can be useful when:
- A suitable visual indicator is unavailable.
- The solution is coloured.
- The reaction has a measurable enthalpy change.
- The endpoint can be inferred from a temperature-volume graph.
For acid-base neutralisation, temperature rises as neutralisation releases heat. After the equivalence point, extra reagent no longer produces the same heat change, so the graph trend changes.
2 | Method Outline
- Measure a fixed volume of one reagent into an insulated cup.
- Record the initial temperature.
- Add the second reagent in measured portions.
- Stir consistently after each addition.
- Record the temperature after each addition.
- Use smaller portions near the expected endpoint if allowed.
- Plot temperature against volume added.
- Estimate endpoint from the intersection of the two best-fit trends.
3 | Temperature-Volume Table
| Volume added / cm3 | Temperature / deg C |
