IB Chemistry HL IA Example 2 (21/24)
This Chemistry HL IA scored 21/24 (Grade 7) and was created by a 43/45 student for the November 2025 session. This IA is up to date with the newest 2025 IB Chemistry HL syllabus.
Title: Investigating the effect of voltage increase on the rate of copper electroplating with graphite cathodes.
Research Question: How does the change in Voltage from a DC power supply (1.86V, 3.47V, 5.61V, 7.31V, 9.63V) affect the rate (g/s) of electroplating solid copper on a graphite cathode for 8 minutes using 150ml of 0.1 mol dm⁻³ Copper (II) Sulphate solution?
This resource is an exceptional exemplar of the Chemistry HL Internal Assessment and can be used as a model for both the structure and the level of investigation and analysis required to achieve a strong Grade 7 in the task.
