IB Chemistry HL Internal Assessment Example

You place the investigation in a specific and relevant chemical context, linking the reaction to real-world chelation applications.

You justify the chosen pH range using chemical reasoning and literature-based ideas about protonation and metal binding.

Your method is detailed enough that another student could largely follow the investigation.

A few procedural details still leave some room for interpretation, such as the exact stirring conditions and drying endpoint.

Some justifications are stronger than others, so a small number of design choices are explained more clearly than the rest.

You present raw and processed data in a clear, organised way with appropriate headings, units, and uncertainties.

You use a sensible processing approach by converting mass loss into rate and comparing replicate results.

You make a genuine effort to consider uncertainty through replicate spread, instrument resolution, and calculated percentage uncertainty.

There are a few calculation and notation issues that reduce confidence in the processing at some points.

Your uncertainty treatment is good but not yet complete, especially for the fitted optimum and the propagation of measurement error.

The mathematical path to the optimum is not always shown clearly enough to be fully transparent.